Dry Fitting the Valve and Pipes — Install New Single-Handle Valve
Part of project
How to Convert a 3-Handle Shower Faucet to a Single-Handle Valve · Step 6 of 9
In this video
With the valve body, first attach the black plaster ground using the two escutcheon screws. This piece helps position the valve correctly within the wall. Determine if you have a thick or thin wall, as this affects valve placement. The center of the valve should be 32 inches from the floor of the tub. Begin by connecting the valve to the tub drop outlet pipe. Measure the distance, cut a piece of 1/2' copper tubing to length, and dry fit it using a copper coupling. Repeat this process for the hot water inlet, cold water inlet, and the shower riser outlet, using slip couplings for easier alignment. This dry-fitting stage ensures all pipes are the correct length and angle before soldering.
Goal: Position and connect the new valve
- The tub drop outlet must be 1/2' copper pipe for the valve to function properly.
- The center of the valve should be positioned 32 inches from the tub floor.
- Use half-inch copper slip couplings for the hot, cold, and shower riser connections to provide more flexibility during installation.
Used in this video
- Tape Measure (Tool Type: Measuring Tools) — Measuring distances for pipe cuts and valve positioning.
- Tube Cutter (Tool Type: Cutting Tool Type) — Cutting copper tubing to the measured lengths.
- Phillips Screwdriver (Tool Type: Screwdriver) — Attaching the plaster ground to the valve body.
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FAQs
This project is rated 'intermediate' and 12 hours. What makes it so complex and time-consuming for a DIYer?
The complexity comes from accessing in-wall plumbing, which often requires opening up the shower wall, and then accurately cutting, re-routing, and connecting new hot and cold supply lines to the single-handle valve. The time includes not just the plumbing, but also crucial steps like structural support installation, rigorous leak testing, and repairing the wall opening before final trim installation.
I'm worried about cutting and soldering copper pipes for the new valve. Are there alternatives or specific safety precautions I should take?
Yes, if you're not comfortable with soldering, you can use PEX piping with crimp or expansion fittings, which might be easier for some DIYers to learn. If you do solder, ensure excellent ventilation, have a fire extinguisher nearby, and protect surrounding materials with a heat shield. Always wear appropriate safety goggles and gloves.
What's the most challenging part of accessing the in-wall plumbing, and how can I avoid damaging existing pipes or electrical wires?
The most challenging part is carefully opening the wall without hitting hidden pipes, electrical lines, or structural elements. Use a stud finder (like the DEWALT DW0150 listed) to identify framing and potential wiring paths, and make small exploratory cuts first. Always shut off water and power to the area before beginning work.
Why is it important that the new single-handle valve is a 'pressure-balancing' type, and what does it do?
A pressure-balancing valve is crucial because it maintains a consistent water temperature by compensating for sudden pressure changes in either the hot or cold water supply. This prevents scalding if someone flushes a toilet or freezing if another faucet is turned on. It's often required by plumbing codes for safety.
Dry Fitting the Valve and Pipes — Install New Single-Handle Valve
Part of project
How to Convert a 3-Handle Shower Faucet to a Single-Handle Valve · Step 6 of 9
In this video
With the valve body, first attach the black plaster ground using the two escutcheon screws. This piece helps position the valve correctly within the wall. Determine if you have a thick or thin wall, as this affects valve placement. The center of the valve should be 32 inches from the floor of the tub. Begin by connecting the valve to the tub drop outlet pipe. Measure the distance, cut a piece of 1/2' copper tubing to length, and dry fit it using a copper coupling. Repeat this process for the hot water inlet, cold water inlet, and the shower riser outlet, using slip couplings for easier alignment. This dry-fitting stage ensures all pipes are the correct length and angle before soldering.
Goal: Position and connect the new valve
- The tub drop outlet must be 1/2' copper pipe for the valve to function properly.
- The center of the valve should be positioned 32 inches from the tub floor.
- Use half-inch copper slip couplings for the hot, cold, and shower riser connections to provide more flexibility during installation.
Used in this video
- Tape Measure (Tool Type: Measuring Tools) — Measuring distances for pipe cuts and valve positioning.
- Tube Cutter (Tool Type: Cutting Tool Type) — Cutting copper tubing to the measured lengths.
- Phillips Screwdriver (Tool Type: Screwdriver) — Attaching the plaster ground to the valve body.
Frequently Asked Questions
This project is rated 'intermediate' and 12 hours. What makes it so complex and time-consuming for a DIYer?
The complexity comes from accessing in-wall plumbing, which often requires opening up the shower wall, and then accurately cutting, re-routing, and connecting new hot and cold supply lines to the single-handle valve. The time includes not just the plumbing, but also crucial steps like structural support installation, rigorous leak testing, and repairing the wall opening before final trim installation.
I'm worried about cutting and soldering copper pipes for the new valve. Are there alternatives or specific safety precautions I should take?
Yes, if you're not comfortable with soldering, you can use PEX piping with crimp or expansion fittings, which might be easier for some DIYers to learn. If you do solder, ensure excellent ventilation, have a fire extinguisher nearby, and protect surrounding materials with a heat shield. Always wear appropriate safety goggles and gloves.
What's the most challenging part of accessing the in-wall plumbing, and how can I avoid damaging existing pipes or electrical wires?
The most challenging part is carefully opening the wall without hitting hidden pipes, electrical lines, or structural elements. Use a stud finder (like the DEWALT DW0150 listed) to identify framing and potential wiring paths, and make small exploratory cuts first. Always shut off water and power to the area before beginning work.
Why is it important that the new single-handle valve is a 'pressure-balancing' type, and what does it do?
A pressure-balancing valve is crucial because it maintains a consistent water temperature by compensating for sudden pressure changes in either the hot or cold water supply. This prevents scalding if someone flushes a toilet or freezing if another faucet is turned on. It's often required by plumbing codes for safety.