You dismantle the faucet and take the seal, 'o' ring or cartridge to hardware store to get an identical item. Then re-build it in reverse order.
In some the @o@ ring does not exist. Therefore you will need to replace the whole faucet gland. To do this again stop the water the the faucet, remove the facuet and check the type you have. If its integrated then you are advised to take this with you to the DIY (Plumbing) supplier to check thread size and which hand (left or right, hot or cold) needs replacement. Most cost about 7$ (5£ uk)
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First,turn water off at floor valve. You dismantle the faucet and take the seal, 'o' ring or cartridge to hardware store to get an identical item. Then re-build it in reverse order.
A trim kit is just the outside parts that you see. This will make you faucet look better, but it wont affect the function of your old valve. If your shower valve doesn't work right, replace it.
cold water tub facuet is corroded bye hard water builtup and needs to be replaced. Hot water is okay. Its the right one with the cold water coming out
If you notice reduced pressure in one of your faucets and not other faucets, and notice that the flow is reduced in both the hot and cold sides of the same faucets then it is probably your aerator. If it is only on one side of your faucet (hot or cold side) then it is probably a mineral buildup in the valve of the faucet (you can clean that side or replace the valves components.) You can also try to loosen the mineral deposits by... first removing the aerator then turn off the supply line valve ( the valve under the sink, several times) to try and dislodge the mineral deposit; if you leave the drain stopper closed and place a dark colored wash rage in the sink, you may notice the deposits flowing through the faucet. While you have the aerator removed clean that or replace it, they are cheap.) If all this fails then you will probably have to replace the valve under the sink.
As in any faucet, you take it apart and replace the cartridge or the rubber seal.
You dismantle it and replace the seal.