How to Change the Cartridge of a Delta Monitor Shower Valve.

The purpose of this Instructable is to illustrate how to change the cartridge of a Delta Monitor shower valve.  The cartridge is the internal working part of the shower valve, if the cartridge is bad, water will continually leak out the spout or you will notice a sudden loss of pressure.   Expensive repair bills may be avoided when you make the repair yourself, also your water bill will decrease, both will save you money. This task can be performed with common household tools.  If you do not own any of the following tools listed, they can be purchased at a local hardware store.  The hardware store should also carry the replacement cartridge for the Monitor shower valve.  To ensure the shower valve is in fact a Delta Monitor, look on the trim plate, there should be the words Delta on the bottom and Monitor on the top (see pictures).  Although these instructions are written so anyone can complete this task, an avid do-it-yourselfer should be able to finish in about 15 minutes.
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Step 1: Gather Material Needed

To easily execute this process the following tools are necessary:

     • Allen Wrenches
     • Tongue and Groove Pliers
     • Needle Nose Pliers
     • Faucet Grease
     • New Cartridge

Not sure, but it might be good to shut of the breaker to the water heater in case the water level in the tank drains below the upper element.