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William Earle / Last Updated on December 19, 2020

How to Install a Moen Shower Valve?

While installing a shower valve, it’s easy to make small mistakes and miss the mark. As a plumber, you wouldn’t fancy that. A Moen shower valve with its flow flexibility and compatibility makes it the most desired shower valve for the plumbers.

These valves have both threaded and soldered connections. Moreover, they are extremely adaptable to any kind of plumbing. So it’s natural that a plumber should know how to install a Moen shower valve easily and convincingly.

How to Install a Moen Shower Valve FI

How to install a Moen Shower Valve?

In a PEX to PEX installation, you’ll be connecting the shower valve to three existing PEX tube. You’ll also connect it to the existing copper tube which is the tub drop outlet. The processes are not much tough, but it takes some systematic approaches to get the job done.

How to install a Moen Shower Valve

Step 1: Preparation

The whole installation process takes about 3 to 4 hours. Two people are recommended to get the job done smoothly. Gather the required tools such as screwdrivers, pliers, wrenches, seal tape, and tape measure.

Preparation

Step 2: Turn off Water Supply

Shut off your home’s main water supply. If you don’t know where it is, then try contacting your local water supply company.

Turn off Water Supply

Step 3: Create a Panel on the Wall

Determine whether the wall is thin or thick. A thick wall is more than 1/4″ and a thin wall is less than 1/4″. Assuming the wall is thin, the next step is to locate the access panel on the wall. By panel, we refer to the service area for plumbing. It should be located on the wall right behind the valve.

If there isn’t an opening, then create one. The dimension of the panel should be 14×14 inches square on the wall with the valve at the center.

 Create a Panel on the Wall

Step 4: Mount the Plaster Ground to the Valve

Attach the plaster ground to the valve using two escutcheon screws. The purpose of the plaster ground is to position the valve and secure it on your tub wall. The center of the valve should be positioned 32″ from the floor of the tub.

Mount the Plaster Ground to the Valve

Step 4: Attach the Valve to Tub Drop Outlet

Now starts the mounting processes. Attach the new valve to the tub drop outlet. The tub drop outlet should be a half an inch copper tubing.

To continue with the process, place the valve in an appropriate position. Measure the distance between the top of the tub drop outlet and valve’s lower tubing.

Cut the copper tubing according to the measurement and attach the tub drop outlet with the copper tube portion via a copper coupling. Attach the whole segment to the existing tub drop outlet of the valve.

Attach the Valve to Tub Drop Outlet

Step 5: Attach the Hot and Cold Water Inlet with the Valve

The next step starts with wrapping the seal thread tape around the inlets and outlet of the valve. Then screw a 1/2″ inch female bolt to the half an inch PEX adapter onto the male threads of each one. Using an adjustable wrench, tighten the bolts.

For each tube of hot and cold water, do proper measurements and use crimp rings and couplings to attach the tubes to the valve adapter. Use a crimping tool to tighten the crimp rings and secure the connections. Follow the same procedures for the other inlet and shower rising outlet.

Attach the Hot and Cold Water Inlet with the Valve

Step 6: Look for Leaks

To get on with this, remove the cartridge from the valve. The removal takes a bit of caution as not to lose the screws. Take off the plaster ground and secure the screws. Then pull out the cartridge retainer clip and use pliers to remove the cartridge.

After that, turn on the home’s water supply and flush the system for 15 seconds with water to remove any debris and look for leaks. Reinsert the cartridge and retainer clip and install the plaster ground again.

 Look for Leaks

Step 7: Solder the Copper Fitting

Before we get to soldering, clean the tubes and valve with emery cloth and flux. Solder the copper tub drop outlet connection with extreme caution and your installation of Moen shower valve is finished.

Solder the Copper Fitting

Epilogue

Although the whole installation process may seem lengthy, it is fairly easy for professional plumbers to get it done. But if you’re a novice, or planning to do the job yourself, you must abide by safety regulations. Being prepared with the right tools and knowing the working ground should give you a good grasp of how well you can pull it off.

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Filed Under: Shower Tagged With: shower valve

William Earle

High I am William Earle, Working on HomeGearKit.com as a writer, editor, and researcher. I worked as a bathroom plumber for a long time. My job was to install and replacement of all kinds of bathroom fittings and accessories like shower and bathtub, bathroom sink or faucet, toilet bowel, toilet seats, shower header, towel bar, curtain rod, and so on. Details

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