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

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

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To easily execute this process the following tools are necessary:

   
     • Allen Wrenches
     • Tongue and Groove Pliers
     • Needle Nose Pliers
     • Faucet Grease
     • New Cartridge
WalterR12 months ago

This is a very nice instructable but it doesn't explain how to decide which of the two cartridges to buy. Here is a link to more info on determining which delta cartridge you have (so you buy the right one) and replacing it.

http://www.handymanhowto.com/replace-leaky-shower-...

WalterR12 months ago

There are two models of Delta cartridge that look almost identical. They are not interchangeable. The cartridge for the old monitor 1300/1400 series showers has a white plastic top PN# RP19804. The cartridge for the newer 1700 series showers has a grey plastic top PN# DRP32104. Often times these fail because the springs inside lose tension. Try stretching out the springs inside your broken cartridge before buying a new one.

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.