A flexible water connection is a simple and optimal device for connecting a mixer to a water supply or water heater. A flexible hose for water supply combines plasticity and strength, is easy to install and can be installed even in the most difficult to reach places.
This device is a long tube through which water passes, with connecting elements at both ends for connection to plumbing products or water heating devices. One hose may have two nuts on both sides (nut-to-nut connection type) or a nut on one side and a fitting on the other (nut-to-fitting connection type). Based on this parameter, the product is selected for various types of connected devices. The faucet product can withstand high and low temperatures and is resistant to rust, so it will last for many years if the operating instructions are followed.
Types of flexible water line
To connect water to a water consumer, two popular types of flexible hoses are used:
Reinforced eyeliner
Reinforced flexible hose is a flexible hose, which consists of high-quality rubber and is covered with a special braid made of various materials. The mesh can be made of stainless steel, aluminum, galvanized metal. It is believed that a hose with nylon braid is guaranteed to fit any operating environment.
Bellows liner
Bellows flexible hoses are steel rings that are seamlessly drawn or pressed under high pressure and welded together. The rings are made of stainless steel. Compared to rubber hoses with metal braiding, they are inferior in flexibility. Wall thickness is about 0.3 mm.
Material of manufacture
Regardless of the type of connection chosen, the main selection criterion is quality. Of course, this affects the price, but it’s not worth saving: a good hose for a kitchen faucet means both a low probability of leaks and durability.
Things to consider:
- Appearance of the product. It should not be deformed or too thin.
- The manufacturer is also important: unknown companies are too risky a choice. They often make a cheap but not reliable product.
- It’s good if the seller is ready to provide quality certificates.
Tip : to avoid lifting heavy pots of water, you can purchase Novara-Plusс. It is equipped with an exhaust hose.
Features of materials used in the manufacture of eyeliner:
- Steel - durable galvanized pipes are not afraid of rust. May expand slightly at high temperatures.
- Copper is ductile, does not rust, disinfects water, and remains operational at +250 °C.
- Brass - withstands up to +300 degrees, resistant to chlorine, high pressure (up to 400 atmospheres).
Peculiarities
Flexible eyeliner has a number of features, among which the positive ones easily stand out. But negative nuances should also be mentioned in order to avoid an unpleasant aftertaste, a waste of time, effort and money.
The advantages of this flexible eyeliner:
- Complete tightness and protection against leaks;
- Saving space, allowing you to install additional interior items or equipment without having to worry about bulky pipes;
- Ease of changing the location of an object connected by a flexible liner;
- Refusal to use a welding machine;
- Protection of the hose from water hammer. That is, if a pressure surge occurs in the water supply system, a high-quality flexible line is protected from rupture and water leakage;
- Easy to install and operate.
Flexible hoses are typically used for various plumbing connections. Most often it is used in bathrooms (connecting a toilet, faucet, boiler to water) and in kitchens.
The best brands
Among most manufacturers there are the most popular companies. These include German companies Grohe and ProFactor, which produce high-quality products. The products are durable, reliable, but expensive. There is a brand from Italy called Remer, which is a competitor to its German counterparts. You can find fakes from this company; they do not include all the components for the mixer.
Among domestic brands, ST Giant eyeliner from Santrade is distinguished. Reviews about this product are mixed. The company produces products at different prices. Products of low cost are of poor quality, hence the different opinions of consumers.
The Spanish brand Industrials Mateu has high product performance and always controls its quality. Products are manufactured according to international quality standards. The Turkish company Rispa, founded in China, has an affordable price and fairly good quality. The product can operate uninterruptedly for many years. Therefore, if you have a limited budget, you can buy products from this company.
Rules for selecting and installing flexible stainless steel hoses
Flexible hoses braided from stainless steel are used to connect plumbing fixtures, plumbing fixtures, heating equipment and household appliances to water supply system pipelines. The connection with a fitting is used for direct connection to mixers. It is not allowed to use flexible hoses in a constant flow mode - instead of pipelines.
Step 1. Decide on the connection type
Eyeliner B-B
At the ends there are two nuts with internal threads. To connect, use key No. 22.
Eyeliner B-N
At the ends there are two nuts: one with an internal thread, the other with an external thread. To connect, use key No. 22.
Eyeliner with fitting
At the ends there is a long or short fitting. This type of liner is usually sold in pairs and is suitable for connecting a faucet. The fittings are made of different lengths for ease of connection. On one fitting the hexagon for the key is lower, on the other - higher. Wrench No. 10 and No. 22 are used, you can also use an adjustable wrench. It is unacceptable to use a gas wrench - it can damage the union nut.
Step 2. Decide on the length of the eyeliner
| Eyeliner | Possible length, cm |
| V-V or V-N | 20, 30, 40, 50, 60, 80, 100, 150, 180, 200, 250, 300, 350, 400 |
| With fitting | 30, 40, 50, 60, 80, 100, 120, 150, 200 |
Step 3. Buy and install eyeliner
Marking
The flexible liner is marked using colored tapes woven into the braid.
- Red - for hot water.
- Blue - for cold water.
- Red and blue are universal.
Recently, only universal-purpose eyeliner has been on sale.
Installation
Before installation, it is necessary to visually inspect the liner for the quality of the sleeve crimp, the quality of the end fittings, the presence of a gasket, the absence of damage to the thread, the integrity of the braid and the possible presence of other defects that may arise during storage and transportation of the product. Installation of flexible hoses with defects is unacceptable!
The connection nut in the flexible connection does not require any additional sealing. Reinforcing this area by winding flax or using fum tape is a common mistake that leads to cracks in the nut. In practice, the existing rubber gasket is sufficient. Sufficient access must be provided to flexible hose connections.
During the installation process it is not allowed:
- Exceed the tightening torque (see table “Technical Specifications”). If you use too much force, you can cut the gasket and the connection will leak.
- Twist the eyeliner.
- Allow tensile forces to be applied to the liner.
- Pull the liner through holes with edges that can damage the braid.
- Bend the liner to a bending radius less than the permissible one (minimum permissible radius 50 mm).
- Electrolysis is not allowed (when copper and iron come into contact). During installation, it is recommended to connect pairs: brass and brass, copper and brass, steel and steel.
After installation and supply of operating pressure, it is necessary to observe the operation of the liner for 30 minutes. If drops are detected at the joints, they must be tightened.
It is recommended to install a flexible connection along with the tap at the beginning of the connection, so that in the event of a breakthrough, you can quickly isolate the leak.
Details
Features of sizes
Rigid connections for mixing devices have a length of twenty to fifty centimeters. The flexible hose can have a length of at least thirty centimeters, maximum two meters.
Connection options
There are variations of the connection node. It may consist of:
1. fitting with a union nut, internal thread with a cross-section of 1⁄2 inches.
2. a thread that is suitable for a mixer type M 10, or a half-inch union nut with an internal thread.
3. A non-standard type of connection is rare: in the form of an M 8 fitting, or a nut measuring 3/8 inch or 3/4 inch. To connect a faucet, sometimes you need an adapter or replacement of all plumbing.
Attention! The hose dimensions should be selected with a certain accuracy so as not to complicate the installation work by using non-standard designs.
Installation work
Having chosen the hose size, it should be connected, observing all the requirements.
If the installation is done incorrectly, the hose will not last long. It will have to be replaced. Things to consider when connecting:
1. At the beginning of the wiring, you should install a filter to improve the quality of the water, so as not to change parts frequently.
2.Before installation, the hose should be checked for defects on the sleeve, thread, and surface. If there are doubts about the condition of the elements, then it is worth repairing the part or replacing it.
3. The flexible hose does not tolerate strong kinks; the product should be installed carefully. The radius of bends should not be greater than six times the cross-section of the liner. Otherwise, the hose will be damaged and leak. The presence of small microcracks will lead to leakage in the near future.
4. If the fittings for the connection are tightly screwed, the tightness may be broken and the fitting may be damaged. When tightening, do not use excessive force.
Attention! Despite the presence of gaskets in the fittings, plumbing flax should be wound around the threads.
5. The fittings should be screwed into the holes on the mixer. The hoses are passed through the holes in the sink. To secure the faucet, clamp brackets are used. The hoses are connected to the water supply pipeline using nuts.
6.At the end of the work, you should check the tightness of the system. Turn on the water in the mixer and observe for leaks for twenty minutes. If there are no defects, then the system is working well. If leaks appear, the gaskets should be replaced, tow should be wound, and everything should be installed again.
Type of eyeliner
The connection to the mixer can be of a hidden or open type. The hidden method is chosen for the bathroom faucet. It is carried out during renovation, because it is necessary to trench the walls, or make a special box.
Hidden eyeliner needs to be done professionally so that you don’t have to break the wall again when making repairs. The open system is easy to install. It is necessary to screw the fasteners to the wall, then connect the mixer to the above diagram.
Nuances of selection and installation
To choose the right hose, you should follow the recommendations:
1.Each hose has a label with parameters containing information about the diameter of the product and connection method.
2.weight indicates the material from which the product is made. Aluminum parts are light, steel parts are heavier. Light weight usually indicates a low quality product.
3. if the fitting is made of plastic, then the hose is unreliable and will not withstand the load.
4.The product must be flexible. If the hose bends poorly, it means the product quality is low. Cracks will quickly appear on the surface.
5.press – sleeves are made of stainless steel; the products must fit tightly during high-quality pressing.
6.The material for the nuts must be of high quality, which can also be judged by the weight and thickness of the product.
7. The hose should not have a strong rubber smell. If there is one, it means the material is of low quality and will not last long.
8. The red marking indicates that it can be used for hot supply, the blue marking for cold supply. There are universal type hoses with stripes of two colors.
9. The hose must have a reserve length so that it is not stretched during installation. Often faucets are supplied with hoses fifty centimeters long, which is enough for installation in the kitchen. A length of one and a half meters is suitable for a bath. Some specialists use such hoses to increase the length; in this situation, an extra element appears, and therefore the strength of the system decreases. It is better to buy eyeliner of the required length.
Operation and Maintenance
- The line must be operated without exceeding the parameters (nominal pressure and temperature of the working medium) set out in the “Technical Specifications” table.
- During operation, exposure of the liner to mineral oils, solvents, liquid hydrocarbons and other liquids that are aggressive to the liner materials is not allowed.
- It is prohibited to operate the liner at sub-zero temperatures and in close proximity to objects with a surface temperature of more than 200ºС and open fire.
- During operation, the liner should be protected from mechanical damage.
- The quality of tightening of the liner connections should be checked at least once every 6 months.
- When reinstalling the flexible hose, check the integrity of the rubber gaskets. Gaskets should be replaced if they are significantly worn or damaged.
Criterion 3. Connection
High-quality crimping of the tip is a good indicator of the reliability of the entire liner. The tip is one of the most important parts of the structure. The service life of the liner and its safety depend on the quality of its manufacture and crimping.
One type of defect is weak compression of the braid. This can happen either due to poor-quality liner material, or due to the lack of special equipment at the manufacturer.
Manufacturing tips and connections from low-grade metal is fraught with deformation, rapid oxidation and corrosion, which ultimately leads to structural failure. Connections can be:
- brass LS-59 coated with nickel-chrome - lasts up to 15-20 years;
- made of stainless steel AISI-304 without protective coating - lasts up to 15-20 years;
- made of ordinary steel, coated with nickel-chrome - lasts up to 1-3 years. To determine the type of metal, just scratch the surface of the braid. If it is made of plain steel, the scratch will be silver, and if it is made of brass, it will be silver-yellow.
Specifications
| Characteristic | Unit change | Meaning |
| Operating pressure | bar | 10 |
| Maximum working pressure | bar | 20 |
| Maximum operating temperature | ºС | 100 |
| Inner diameter of rubber hose | mm | 8,5±0,5 |
| Braided hose outer diameter | mm | 12,5±0,5 |
| Capacity at 3 bar differential pressure | ºС | 100 |
| Maximum operating temperature | l/min | 35 |
| Minimum permissible bending radius | mm | 50 |
| Inner diameter of connecting fitting | mm | 6,2 |
| Recommended maximum tightening torque | N/m | 0,4 |
| Average service life | years | 10 |
Criterion 5. Fitting
Looking inside the hose, you can see a brass fitting. Its presence is an indicator of high-quality eyeliner. In counterfeit products, fittings/nipples are often made of plastic, which is unacceptable.
The fitting is made only from stainless steel, plain or nickel-plated brass and aluminum.
Low-grade metal should not be used in the manufacture of the nipple, and the thickness of the product should not be lower than permissible. Otherwise, these shortcomings will lead to rapid failure of the entire flexible line.
Flexible hose design and materials
| Pos. | Item name | Material |
| 1 | Inner tube of flexible hose | Ethylene propylene rubber |
| 2 | Outer braid (8 steel threads) | Stainless steel |
| 3 | Connecting fitting | Brass |
| 4 | Union nut | Nickel-plated brass or stainless steel (depending on manufacturer) |
| 5.1 | Union | Nickel-plated brass or stainless steel (depending on manufacturer) |
| 5.2 | Connection for mixer (17/45 mm) | Nickel-plated brass or stainless steel (depending on manufacturer) |
| 6 | Crimp sleeve | Stainless steel |
| 7 | Sealing gasket | Ethylene propylene rubber |
Remember! It is not allowed to use flexible hoses in a constant flow mode - instead of pipelines.
Dimensions
Before purchasing a product, you should determine the required length. Most branded models come with a 50 cm hose included. This is enough to connect a faucet in the kitchen.
It is important to take preliminary measurements, since the layout of the room and the placement of water supply points may differ. The diameter of the union nut is also important. It can be ⅜ - 1”. The fitting has a standard value - M10.
Recommendation : A large family will benefit from a double sink like the N200. It will fit twice as many dishes.
The method of connecting the hose to the faucet in the kitchen may differ:
- Petal Latch + Fitting - Simply push the tube into the bottom of the faucet until you hear a click.
- Thread - the part is simply screwed in.
- The push-in connector is a cylinder-shaped sleeve, which on one side is divided into 4 petals. By rotating the nuts, they bend towards the center, which ensures fixation.
Educational program: What does a kitchen faucet consist of: 5 different models
Chrome faucet connection
Hard liners are chrome-plated pipes made of annealed copper. Copper faucet connections are considered the best. The annealed copper tube bends easily, making it easy to connect the main pipes to the mixer. A special - food grade - grade of copper is used.
Chrome faucet hose
For example, copper tubes for supplying water to a mixer manufactured by the German company Kaiser have an internal diameter of 8 mm, an external diameter of 12 mm and a bending radius of 35 mm. Designed to operate at a pressure of 16 atm, but tube destruction occurs at pressures above 50 atm. Water temperature – from -50 to +150° C.
The cost of a pair of tubes with a total length of 1 m is 790 rubles. (according to the price list of the site https://xn--80agdc3biapdm8a.xn--p1ai/ )
“Where can I buy faucet liner?” - this article on our website can become your guide to the plumbing fittings market
Read about how to change the connection to the mixer here:
An article about branded connections for Grohe faucets will tell you not only about specific German-made fittings, but also explain how the Western approach to doing business differs from the Russian one
Copper tubes produced by the Italian company Remer with a diameter of 10 mm are slightly cheaper: a little more than 550 rubles. per pg. m (according to the price list of the site https://www.san-detal.ru ).
Connecting tubes to the mixer and pipes - through threaded and collet connections, union nuts, couplings. The material of fasteners is brass, the seal is nitroelastomer and other types of seals.
Reinforced
The first type of flexible hose is a soft elastic hose, reinforced with wire braid, with connecting elements at the ends (fittings). The tube has a complex structure, despite its simple appearance. It is made from synthetic EPDM rubber or PEX cross-linked polyethylene. It is braided with a thread of wire made of stainless steel or aluminum. The reinforced liner, which can withstand higher pressure, has a nylon braid.
Mr. Build recommends (strongly!): Do not use flexible hose with galvanized wire braid. This is the most unreliable hose that can burst at any moment.
The product is cut at the factory into pieces of the required length. At the ends, metal nipples with fittings or union nuts are inserted into it. Then the braid with the hose is compressed with a steel sleeve around the bushing. Connection to pipes is made through rubber seals.
Flexible water liner has different diameters: 1 and 1/2 inches, 3/4, 3/8.
Criterion 6. System temperature and pressure
To correctly answer the question - how to choose a flexible water supply - you also need to pay attention to the technical parameters of the plumbing system. This is, first of all, pressure in the pipes and water temperature. If the eyeliner does not meet the indicators, it will quickly become unusable.
While you can always determine the water temperature yourself, it is quite difficult to find out the pressure parameters in the system. If it is impossible to determine specific indicators, then you can focus on standard figures characteristic of all water supply systems.
- Central water supply - 4 atm.
- Closed heating system with coolant circulation - 1.5-3 atm.
- Centralized heat supply - 2-4 atm.
In the case of heat supply, peak loads are possible, so when making calculations it is better to include a plus of 20-25%.
How to choose a faucet hose?
Experts recommend that when choosing flexible hoses for installing plumbing fixtures in the kitchen or bathroom, pay attention to the following details:
- Having a label with the specified technical characteristics will help prevent mistakes. Make sure the diameter and type of fastener matches your equipment.
- Be sure to pay attention to the weight of the product; if it has an aluminum braid, the hose will be much lighter than one that uses steel (in most cases, such products have a fitting of dubious quality). As practice shows, they quickly fail, literally within six months, or even earlier.
- You should discard the liner if it is equipped with a plastic fitting; such a mount is not designed for the load required for domestic purposes.
- If the hose is insufficiently flexible, you should also not purchase it, since this sign indicates poor quality. As a rule, this causes several microcracks to appear in the braid, which can cause deformation.
- Pay attention to the sleeve press; stainless steel should be used as the material for them. It is important that their tubes are held tightly - this is an indicator of high-quality pressing.
- Check the design of the union nuts; if they are very thin or light, it means that this is a low-quality product and there is a high probability of problems when using it.
- Low-quality rubber has a sharp, characteristic odor; if you find one, discard this model, since such material will begin to leak quite quickly.
- When choosing hoses for hot water, do not make a mistake with the color marking; they should have a red or red-blue thread; those with a blue mark are not suitable.
- Choose an eyeliner of the appropriate length; it is not advisable for it to sag or be stretched.
- Many branded devices (for example, Damixa or Hansgrohe) include 50 cm hoses. To connect a faucet in the kitchen, the length is quite enough, but to connect other equipment they may be short, for example, the standard placement above the bathtub is 150 cm. In this case, you can remove them and screw on the liner of the required length or use it as an extension cord. The last option is not entirely successful. This is due to the fact that an extra connection will appear in the extended hose, which means reliability will decrease.
- Which product to choose, imported or domestically produced, does not really matter; we note that our products are sometimes better and more reliable than foreign ones.
Recommendations for selection
When choosing a flexible hose for your kitchen faucet, you should pay attention to the following characteristics:
- Availability of technical characteristics of the model on the packaging . It is especially important to ensure that the line can be used to transport drinking water;
- No suspicious cheapness. Products that are too cheap will not only quickly become unusable, but can also contaminate the liquid;
- The material of the seals must be elastic and of high quality;
- The thread on the fitting must be smooth and deep enough;
- The braid should not have sharp edges or visible damage;
A smooth, seamless coating is a sign of a high-quality reinforced hose
- The fitting sleeve must be tightly secured;
- No technical odors.
I do not recommend buying lightweight samples, since they are most likely made of fragile and short-lived silumin.
