Since you stated that you do not have an access panel for the faucet you are correct in assuming that you will need to shut off the main.
Repair leaking garden tub faucet.
When you start to see water leaking out of the spout you will need to replace the worn seats and springs to correct the problem.
You can fix most bathtub plumbing problems with the replacement parts available at hardware stores and home centers.
No need to call the plumber.
If your bathtub faucet is dripping hopefully this will help you get it fixed.
How to replace seat.
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If you need to repair a leaky bath tub faucet start by turning off the water to your home and opening the hot and cold water valves in your bath to drain any water still in the pipes.
Diy bathtub faucet repair fixing a leaking dripping faucet yourself without paying a plumber.
A leaky tub spout can be a real pain but it might be an easy fix.
A plumbing parts distributor will carry a much larger selection and may be able to special order hard to find items.
Then use a philips screwdriver to remove the handle from the wall before unscrewing the trim and collar by hand.
A leaking tub faucet is a friendly diy project lets do this.
As a space saving measure the bathtub faucets in mobile homes and large rvs often use a single body design in which the tub spout and hot and cold water handles are incorporated into a single unit.
A leaky bathtub faucet can lead to excess water usage and the deterioration of your spout s interior parts.
Delta tub faucets contain rubber seats that look similar to washers as well as metal springs to help regulate the flow of hot and cold water through the faucet.
Below are links to videos mentioned during this project.
Hiring a plumber can be a costly and time consuming task but repairing the leak yourself is generally an easy fix.
The first step for bathtub faucet repair is to make sure you have the new parts that you need.
Once the main is off open a faucet on the first store of the house to releave the pressure from your system.