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Pressurize and Test for Leaks — Test for Leaks

Intermediate

Part of project

How to Replace a Two-Handle Shower Faucet · Step 6 of 8

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After the bypass assembly is fully installed, it's time to test for leaks. First, ensure all three of the newly installed ball valves are in the closed position. Go to the main water shut-off valve for the house and turn it on very slowly. Listen for the sound of pipes filling. Return to the bypass assembly and meticulously inspect every new fitting and connection for any signs of water drips or leaks. Once you're confident there are no leaks, open the main bypass valve to restore water to the rest of the house.

Goal: Pressurize the new system and check for any leaks.

  • Failure to turn on the water slowly can cause water hammer, potentially damaging your plumbing system.
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This Old House

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FAQs

Is this project truly 'intermediate,' and what specific skills do I need to successfully replace my two-handle shower faucet?

Yes, this project is rated intermediate primarily because it involves soldering copper pipes, which requires practice and a steady hand. You'll also need basic carpentry skills for opening and repairing the access hole, and a good understanding of how to properly shut off and drain your home's water supply. If you're new to soldering, practice on scrap copper pipe first to gain confidence before working on the live plumbing.

What are the most critical safety precautions I should take when working with a propane torch and soldering pipes inside a wall?

Always ensure proper ventilation to dissipate fumes, and keep a fire extinguisher or bucket of water nearby in case of accidental ignition. Clear the work area of all flammable materials like insulation, wood studs, and plastics before beginning to solder. Wear appropriate safety glasses and heat-resistant gloves, and never point the torch flame at anything other than the pipe connection you are working on.

How can I prevent leaks after installing the new valve, and what should I do if I discover one during the initial test?

To prevent leaks, ensure all pipe ends and fittings are clean, properly fluxed, and heated evenly for the solder to flow completely around each joint. After soldering, perform a thorough leak test by slowly turning the water back on and checking every new connection with a dry paper towel for at least 15-30 minutes. If you find a leak, turn off the water immediately, drain the line, and re-solder the faulty joint after inspecting it for imperfections.

Do I really need specific tools like a propane torch and plumbing solder, or are there alternative connection methods for a DIYer?

This project, as detailed, requires soldering for a professional and durable connection, which necessitates a propane torch, lead-free solder wire, and flux paste. While alternatives like push-to-connect (e.g., SharkBite) or press-fit fittings exist and don't require a torch, they often cost more per fitting and require different specialized tools. Soldering is a reliable and common method for copper plumbing, offering a secure, long-lasting seal.

Transcript
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my water softener all right we are all finished these are closed this is closed I have everything anchored and secured really well this is really important again you don't want to put an undo stress on your pipes now part of not wanting to put any undo stress on your pipes is when you're turning your water back on and I'm gonna turn the water on this is this is live I'm not editing it unless I have to edit it but when you start to turn your water back on you want to do it very slowly because what will happen if you don't is you can damage your pipes because if you think about water going up a pipe and hitting whatever it is that it's gonna that's gonna stop it it can put a lot of stress to say this is stopping and if you just crank that open and you hit this you could break this seam if it's a if it's a PVC type fitting or or a port a port even solder so you always want to open your valves up slowly and let water into the line slowly now I've opened this this is now open my water meter is no longer running and there is water up to here right now there's water up to here right now and what I'm gonna be able to do next is open up this valve and let it travel up to here and

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