Remove Old Valve and Install New Valve Body — 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 water supply shut off, the old three-handle valve and its connected galvanized pipes are cut out and removed from the wall cavity. New PEX tubing is run from the existing hot and cold water supply lines. The new Moen single-handle valve body is securely mounted inside the wall. The PEX supply lines are then connected to the hot and cold inlets on the valve using threaded adapters. A new galvanized pipe is installed for the shower riser, connecting to the top outlet of the valve. For the tub spout, a short piece of copper pipe with a 90-degree elbow is connected to the bottom outlet of the valve. PTFE tape is used on all threaded connections to ensure a leak-proof seal.
Goal: Install new shower valve body
- Ensure the valve is installed squarely and securely. An improperly mounted valve can lead to trim kit installation issues and potential leaks.
- Connect the hot supply to the left inlet and the cold supply to the right inlet of the valve, which is the standard configuration.
Used in this video
- Reciprocating Saw — Cutting out old galvanized pipes.
- Pipe Wrench — Gripping and turning pipes and fittings.
- PEX Tool — Creating secure connections with PEX tubing (e.g., crimping or expanding).
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FAQs
Given the 'intermediate' difficulty, what's the most challenging part of this conversion, and can I realistically finish it in 12 hours?
The most challenging aspects are accurately cutting and soldering copper pipes for the new valve, and then skillfully repairing the wall to a professional finish. While 12 hours is an estimate for experienced DIYers, expect it to take longer if you're new to soldering or drywall work, especially accounting for drying times for joint compound.
What are the essential safety precautions I must take when cutting and soldering plumbing, and opening up a wall?
Always shut off your home's main water supply completely before starting any plumbing work. When soldering, ensure good ventilation, wear eye protection, and keep a fire extinguisher nearby. Be extremely careful when cutting into the wall to avoid hidden electrical wires, gas lines, or other pipes.
The required tools list includes items like an awning and weatherstripping. Are these really necessary for this specific plumbing project?
Some items in the provided list, such as the awning, weatherstripping, and wall switch, appear to be irrelevant for converting a shower faucet. Focus on essential plumbing tools like a pipe cutter, reamer, soldering torch, copper fittings, flux, and solder, alongside basic carpentry tools for wall repair, and a drill/driver for mounting.
What's the most common mistake DIYers make when soldering copper pipes, and how can I avoid leaks?
A frequent mistake is not properly cleaning and fluxing the pipe ends and fittings before heating, which prevents a strong capillary bond. Ensure surfaces are shiny clean, apply flux evenly, heat the fitting (not the solder) until the solder flows into the joint, and avoid moving the joint until it cools to prevent pinhole leaks.
Remove Old Valve and Install New Valve Body — 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 water supply shut off, the old three-handle valve and its connected galvanized pipes are cut out and removed from the wall cavity. New PEX tubing is run from the existing hot and cold water supply lines. The new Moen single-handle valve body is securely mounted inside the wall. The PEX supply lines are then connected to the hot and cold inlets on the valve using threaded adapters. A new galvanized pipe is installed for the shower riser, connecting to the top outlet of the valve. For the tub spout, a short piece of copper pipe with a 90-degree elbow is connected to the bottom outlet of the valve. PTFE tape is used on all threaded connections to ensure a leak-proof seal.
Goal: Install new shower valve body
- Ensure the valve is installed squarely and securely. An improperly mounted valve can lead to trim kit installation issues and potential leaks.
- Connect the hot supply to the left inlet and the cold supply to the right inlet of the valve, which is the standard configuration.
Used in this video
- Reciprocating Saw — Cutting out old galvanized pipes.
- Pipe Wrench — Gripping and turning pipes and fittings.
- PEX Tool — Creating secure connections with PEX tubing (e.g., crimping or expanding).
Frequently Asked Questions
Given the 'intermediate' difficulty, what's the most challenging part of this conversion, and can I realistically finish it in 12 hours?
The most challenging aspects are accurately cutting and soldering copper pipes for the new valve, and then skillfully repairing the wall to a professional finish. While 12 hours is an estimate for experienced DIYers, expect it to take longer if you're new to soldering or drywall work, especially accounting for drying times for joint compound.
What are the essential safety precautions I must take when cutting and soldering plumbing, and opening up a wall?
Always shut off your home's main water supply completely before starting any plumbing work. When soldering, ensure good ventilation, wear eye protection, and keep a fire extinguisher nearby. Be extremely careful when cutting into the wall to avoid hidden electrical wires, gas lines, or other pipes.
The required tools list includes items like an awning and weatherstripping. Are these really necessary for this specific plumbing project?
Some items in the provided list, such as the awning, weatherstripping, and wall switch, appear to be irrelevant for converting a shower faucet. Focus on essential plumbing tools like a pipe cutter, reamer, soldering torch, copper fittings, flux, and solder, alongside basic carpentry tools for wall repair, and a drill/driver for mounting.
What's the most common mistake DIYers make when soldering copper pipes, and how can I avoid leaks?
A frequent mistake is not properly cleaning and fluxing the pipe ends and fittings before heating, which prevents a strong capillary bond. Ensure surfaces are shiny clean, apply flux evenly, heat the fitting (not the solder) until the solder flows into the joint, and avoid moving the joint until it cools to prevent pinhole leaks.