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Over time, the seal of a faucet deteriorates and its sealing function is no longer ensured. Depending on the type of valve, there are one or more gaskets to replace. This handy sheet provides you with tips for checking and changing the faulty seal of a faucet over those most commonly used.

How to change the seal of a faucet?

How to change the seal of a faucet?

Change of a gooseneck valve seal

Before any tap valve change operation, it is necessary to cut off the water supply, empty the water contained in the tap by opening it and then closing it again. Be sure to cover your washbasin with a cloth to protect it and to close the bung to avoid the loss of the screws.

The mixing valve has two braces (or handles), one for hot water and the other for cold water.

  • Remove the colored pellets so you can unscrew the screw located below and remove the braces;
  • Unscrew the faucet head with a wrench;
  • Flip the faucet head to gain access to the seal and the valve seal.

If the joints are rough, cracked or stiff, it's time to change them.

Check for limescale in the tap head housing by using your finger. If limestone is present, remove it cleanly with a tap-in machine (a device for removing limescale by milling).
After reassembling your new seals, reinstall the various parts and check the tightness.

Replace a joint of a mixer tap

The mixer tap has a single control for adjusting the temperature and the water flow. The preliminary operations mentioned above to replace a seal are identical to this type of valve.

  • Disassemble the faucet handle by unscrewing the screw located either under the color pad or under the decorative cap above the faucet;
  • Remove the bulging part;
  • Loosen or unscrew the cartridge mechanism so that it can be removed from the valve.
  • Replace the seals in place with new ones, making sure you have the right diameters and the right thicknesses.
  • Re-assemble everything by reversing disassembly operations while taking care to mount the cartridge in the correct direction.

Check that the faucet is tight. In case of new leaks, disassemble your mixing valve again to check the correct position of the seals.
If the seals are in place and your faucet is still leaking, the cartridge change is necessary respecting the faucet mark.

The thermostatic valve seals can also be replaced on the same principle as these two faucets. You will need to remove both adjusters to access the valve head or cartridge.

It is best, when changing the faucet joint, to disassemble your faucet beforehand and take the used seals with you for the purchase of new ones. Thus you will be sure to have the right seal for your faucet but you will also enjoy the advice of a professional as to the material of the seal to choose.

Video Instruction: Part 1 of 2: How to Fix a Dripping Faucet