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Modify Plumbing Connections — Faucet Installation: Connecting the New Shower Faucet

Intermediate12 hours

Part of project

Install a Tub & Shower Combo: Faucet Replacement Guide · Step 3 of 4

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In this video

With the water turned off, cut away the old shower valve. Install new brass fittings onto the hot (red) and cold (white) PEX supply lines. Attach the shower panel's flexible, braided supply hoses to these new fittings. Wrap the threads of the fittings with Teflon tape three times and use two wrenches to tighten the connections securely to prevent leaks.

Goal: Connect water supply to the new shower panel

  • Test for leaks by briefly turning the water back on before closing up the wall.

Used in this video

  • Adjustable Wrench (brand: Not specified, Tool Type: Hand Tools, Power Source: Manual)Tightening plumbing fittings.
  • Pipe Cutter (brand: Not specified, Tool Type: Hand Tools, Power Source: Manual)Cutting the existing PEX pipes.
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FAQs

How accurate is the 12-hour estimated time, and what factors could significantly extend this project for a DIYer?

The 12-hour estimate is for an intermediate DIYer in ideal conditions. Unexpected issues like significant wall damage, corroded old plumbing, or difficult-to-remove fixtures can easily double the project time. Always allocate extra time for unforeseen challenges, especially during demolition.

What is the absolute first safety step, and what should I do if I can't turn off the main water supply?

Always turn off your home's main water supply before starting any demolition or disconnection. If you cannot locate or operate your main shut-off valve, contact a professional plumber immediately. Proceeding without cutting the water can cause severe flooding and significant property damage.

Beyond the basic hand tools, what specialized tools or materials are crucial for ensuring a leak-free faucet installation with PEX or CPVC?

For PEX, a dedicated PEX crimp tool and appropriate crimp rings are essential for secure connections. If using CPVC, you'll need CPVC primer and solvent cement. Always use plumber's tape or thread sealant on all threaded connections and plumber's putty for the tub drain assembly to prevent leaks.

What is the most common mistake DIYers make that leads to leaks after installation, and how can I avoid it?

The most common mistake is failing to properly seal connections or not adequately tightening fittings. Ensure all PEX/CPVC connections are correctly crimped or glued, and all threaded connections are wrapped with Teflon tape and firmly tightened. During the leak test, turn water on slowly and meticulously inspect every joint for drips.

Transcript
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So I have cut off the original valve here and I placed new brass fittings in here and my biggest problem was trying to get it so that these were water tight I had to make sure that you know put the Tafflon tape on correctly three wraps and tighten it So make sure you have two wrenches when you do that. That's really helpful, but it looks like it's water tight now

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