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How to install shower valve extension kit

How to install shower valve extension kit

When we are working on a bathroom renovation or remodeling project, we often come across situations where shower valve extensions need to be installed, such as thicker walls, additional tile layers, or other structural changes. Only with the shower valve extension installed were we able to properly connect the shower valve trim to the existing plumbing.
Now we will provide a step-by-step installation guide to make sure you correctly install your shower valve extension kit by yourself.

Material preparation:

  • Shower valve extension kit (including extension sleeve and necessary fittings)
  • Adjustable wrench
  • Pipe cutter or hacksaw
  • Plumber's tape (Teflon tape)
  • Pipe dope or thread sealant
  • Screwdriver
  • Pliers
  • Rag or towel
  • Safety goggles
  • Gloves

Step 1: Prepare

Before starting the installation process, be sure to turn off the water supply to the shower system to prevent any water flow during the installation.

Step 2: Remove trim and existing valve

Using a screwdriver to remove the trim plate covering the shower valve, carefully unscrew it from the pipe and remove the existing valve.

Step 3: Measure and cut the extension sleeve

Take the extension sleeve provided in the kit and measure the depth needed to bridge the gap between the valve and the finished wall. Using a pipe cutter or hacksaw, cut the extension sleeve to the measured length. Make sure the cut is clean and even.

Step 4: Apply plumber's tape and thread sealant

Take the extension sleeve and apply plumber's tape (Teflon tape) to the threaded end. Wrap tape clockwise around threads to ensure a tight seal. Next, apply a thin coat of pipe dope or thread sealant to the threads to further strengthen the seal and prevent any leaks.

Step 5: Install extension sleeves

Carefully screw the extension sleeve onto the existing pipe, making sure it is snug and aligned with the finished wall. Tighten the connection securely with an adjustable wrench. Be careful not to overtighten as this may damage the pipe.

Step 6: Install the new shower valve

Take your new shower valve and attach it to the extension sleeve. Again, use an adjustable wrench to tighten the connection firmly, but not with excessive force.

Step 7: Test for leaks

Once the valve is securely connected, turn on the main water supply to the shower. Carefully check for any leaks around the fittings and valves. If you notice any leaks, tighten the connections slightly or apply additional thread sealant as needed until the leak is resolved.

Step 8: Reassemble the trim

After making sure there are no leaks, reinstall the trim plate onto the shower valve and secure with the appropriate screws. Make sure the trim is properly aligned and flush with the wall.

Step 9: Final inspection

Turn on the shower and test the function of the valve. Check that the hot and cold water is properly regulated and there are no unusual noises or problems during operation. If everything works as expected, we have successfully installed the shower valve extension!

In order to make it easier for everyone to understand installation guide, we take Bostingner's shower valve extension kit as an example to show you how to install the shower valve extension kit quickly.


  • Unscrew the decorative cap by hand.
  • Unscrew the retaining ring with a wrench.
  • Take out the cartridge.
  • Unscrew the brass sleeve.
  • Pull out the built-in check valve for cleaning.
  • Put the extension brass sleeve, make sure to press it on the docking position.
  • Stack cartridge extender accessories.
  • Twist the brass sleeve extender tight.
  • Twist the retaining ring tight with a wrench.
  • Twist the decorative cap by hand.
  • Screw the diverter with a screwdriver.

Here is the video guide about how to install shower valve extension kit:

Installing the shower valve extension is not a particularly difficult thing, just follow the installation guide we provide above, plus the video guide for installing the Bostingner extension kit as a reference, I believe it is easy for everyone to install or replace the shower valve extension. Remember to take the necessary safety precautions, take accurate measurements and use the provided materials and tools properly.

FAQ About Shower Valve Extension Kit

Q: What is a shower valve extension kit?
A: A Shower Valve Extension Kit is a plumbing fitting used to extend the length of a shower valve handle or trim for easier operation and access. It is often used when existing valve handles are difficult to reach or when wall thicknesses have been modified during a bathroom remodel.

Q: What tools are needed to install the shower valve extension kit?
A: The exact tools needed may vary by the manufacturer and model of the extension kit, but generally you will need some common tools such as an adjustable wrench, pliers, screwdriver, and possibly a drill with the appropriate bits. Also, if you need to modify any plumbing, you'll likely need plumber's tape, thread sealant, and a pipe cutter or hacksaw.

Q: How do I know if I need a shower valve extension kit?
A: If you find it difficult to reach or operate your existing shower valve handle due to thick walls, you may need a shower valve extension kit. Also, if you're installing new tile or thickening the walls during a bathroom renovation, you may need an extension kit to make sure the handle sticks out far enough from the wall.

Q: Where can I buy a shower valve extension kit?
A: Shower valve extension kits can be found at most home improvement stores, plumbing supply stores, or online retailers that specialize in plumbing supplies. Check your local store or search online to find a kit that fits your needs.

Here is for Bostingner shower valve extension kit:

Q: Are all shower valve extension kits the same?
A: No, shower valve extension kits may vary in design, compatibility, and installation method. It is important to choose a kit that matches the make and model of your existing shower valve to ensure proper installation and function. If you're unsure about compatibility, see the manufacturer's instructions or consult a plumbing professional.

Q: Can I install the shower valve extension kit myself, or should I hire a professional?
A: If you have some plumbing experience and are confident in your abilities, you can try installing a shower valve extension kit yourself. However, if you are unsure about any aspect of the installation, or if you are not comfortable working with plumbing, it is recommended that you hire a professional plumber. Improper installation can lead to leaks, damage, or other plumbing problems, so it's best to play it safe and seek professional help if needed.

Q: Can I use the shower valve extension kit with any type of shower valve?
A: Shower valve extension kits are usually designed to be compatible with a specific make and model of shower valve. It is important to choose the right kit for your specific shower valve to ensure proper installation and function. If you're unsure about compatibility, consult the manufacturer's instructions or seek advice from a professional plumber.

Q: Can the shower valve extension kit be removed or adjusted after it is installed?
A: Yes, in most cases the shower valve extension kit can be removed or adjusted as needed. However, how easy it is to remove or adjust depends on the specific kit and how it was installed. Follow the manufacturer's instructions or consult a professional plumber for guidance on how to make any necessary changes to the extension kit.


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