Connect Valve to Bathtub Plumbing — Gain Access to Underside Plumbing
Part of project
How to Replace a Deck-Mount Garden Tub Faucet · Step 2 of 9
In this video
Access the plumbing behind the bathtub through the access panel. Identify the hot and cold water supply lines. Cut the existing CPVC pipes to insert T-fittings. Using CPVC primer and cement, glue the T-fittings into the hot and cold lines. Connect short pieces of CPVC pipe and elbows as needed to route the water from the T-fittings to the corresponding hot (H) and cold (C) inlets of the thermostatic mixing valve. Connect the mixed water outlet (marked 'MIX' or similar) of the valve to the bathtub faucet's water supply line. Ensure all connections are secure and allow the cement to fully cure as per the manufacturer's instructions before turning on the water.
Goal: Install Mixing Valve
- Work in a well-ventilated area when using CPVC primer and cement due to strong fumes.
- Double-check that the hot water line is connected to the 'H' inlet and the cold water line to the 'C' inlet on the valve.
Used in this video
- Pipe Cutter — Cutting the CPVC pipes to the correct length.
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FAQs
Is this project truly intermediate, and what are the main challenges I might face?
Yes, this project is rated intermediate due to the tight spaces often found under garden tubs, potential corrosion on old fasteners, and the critical need for watertight seals. Expect to spend significant time gaining access, maneuvering tools, and meticulously checking for leaks. Patience and preparation are key.
My old faucet seems stuck or corroded to the deck. What's the best way to loosen it?
Corrosion is common. Apply a penetrating oil like KROIL directly to the nuts under the tub deck and allow it to soak for at least 30 minutes, or even an hour. Use a basin wrench for extra leverage in tight spots, as it's designed for these hard-to-reach fittings.
What are the most common reasons for leaks after installing a new deck-mount faucet, and how can I prevent them?
Leaks typically occur from improperly sealed connections or loose fittings. Always apply 2-3 wraps of Teflon tape clockwise to all threaded pipe connections before tightening. For the faucet body, ensure you use a generous but neat amount of plumber's putty around the base to create a watertight seal against the tub deck.
My tub's access panel seems too small or is difficult to open. What should I do if I can't reach the plumbing easily?
Gaining proper access is crucial and sometimes the most challenging part. Use a headlamp for visibility and consider temporarily removing any surrounding trim or cabinet components if necessary. If space is extremely limited, you might need to carefully enlarge the access opening, ensuring it can be neatly covered afterward.
Connect Valve to Bathtub Plumbing — Gain Access to Underside Plumbing
Part of project
How to Replace a Deck-Mount Garden Tub Faucet · Step 2 of 9
In this video
Access the plumbing behind the bathtub through the access panel. Identify the hot and cold water supply lines. Cut the existing CPVC pipes to insert T-fittings. Using CPVC primer and cement, glue the T-fittings into the hot and cold lines. Connect short pieces of CPVC pipe and elbows as needed to route the water from the T-fittings to the corresponding hot (H) and cold (C) inlets of the thermostatic mixing valve. Connect the mixed water outlet (marked 'MIX' or similar) of the valve to the bathtub faucet's water supply line. Ensure all connections are secure and allow the cement to fully cure as per the manufacturer's instructions before turning on the water.
Goal: Install Mixing Valve
- Work in a well-ventilated area when using CPVC primer and cement due to strong fumes.
- Double-check that the hot water line is connected to the 'H' inlet and the cold water line to the 'C' inlet on the valve.
Used in this video
- Pipe Cutter — Cutting the CPVC pipes to the correct length.
Frequently Asked Questions
Is this project truly intermediate, and what are the main challenges I might face?
Yes, this project is rated intermediate due to the tight spaces often found under garden tubs, potential corrosion on old fasteners, and the critical need for watertight seals. Expect to spend significant time gaining access, maneuvering tools, and meticulously checking for leaks. Patience and preparation are key.
My old faucet seems stuck or corroded to the deck. What's the best way to loosen it?
Corrosion is common. Apply a penetrating oil like KROIL directly to the nuts under the tub deck and allow it to soak for at least 30 minutes, or even an hour. Use a basin wrench for extra leverage in tight spots, as it's designed for these hard-to-reach fittings.
What are the most common reasons for leaks after installing a new deck-mount faucet, and how can I prevent them?
Leaks typically occur from improperly sealed connections or loose fittings. Always apply 2-3 wraps of Teflon tape clockwise to all threaded pipe connections before tightening. For the faucet body, ensure you use a generous but neat amount of plumber's putty around the base to create a watertight seal against the tub deck.
My tub's access panel seems too small or is difficult to open. What should I do if I can't reach the plumbing easily?
Gaining proper access is crucial and sometimes the most challenging part. Use a headlamp for visibility and consider temporarily removing any surrounding trim or cabinet components if necessary. If space is extremely limited, you might need to carefully enlarge the access opening, ensuring it can be neatly covered afterward.