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Install New Cartridge — Install the New Delta Monitor Valve Cartridge

Beginner3 hours

Part of project

Delta Monitor Shower Faucet Installation & Replacement Guide · Step 3 of 5

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In this video

Prepare the new Moen cartridge for installation. Apply a light coat of the provided plumber's grease to all the rubber O-rings and gaskets on the cartridge. This lubrication helps it slide in smoothly and creates a better seal. Align the 'H C' (Hot/Cold) markings on the cartridge correctly with the valve body (usually 'H' on the left). Carefully slide the new cartridge into the valve body until it is fully seated. Secure it in place by re-installing the retaining clip.

Goal: Install the new Moen valve cartridge into the valve body.

  • Improper alignment of the cartridge can result in reversed hot and cold water.

Used in this video

  • Pliers (Tool Type: Pliers, Power Source: Manual, Pliers Type: Needle-nose) · optional — Inserting the retaining clip.
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FAQs

What specific tools are essential for replacing a Delta Monitor shower faucet?

You'll primarily need a Phillips head screwdriver for trim removal and installation. A crucial specialized tool is an Arcan Hardened 3 in. Gear Puller AS3GP, which is often necessary for removing a stubborn old valve cartridge. Have penetrating oil and silicone grease ready as well.

What's the most important safety precaution I need to take before starting this project?

The most critical step is to completely shut off the water supply to the shower. This can be done at the main house shut-off valve or by turning off individual hot and cold water lines if available. Double-check that no water flows from the shower before proceeding to prevent flooding.

I'm a beginner. How difficult is this project, and how long should I expect it to take?

This project is classified as beginner difficulty, meaning it's manageable for those new to DIY. The estimated time for completion is around 3 hours. However, this can vary depending on the condition of your old faucet and any unexpected issues, so allow some extra time.

What should I do if my old shower cartridge is stuck and won't come out?

A common issue is a stubborn old cartridge. First, try applying penetrating oil around the cartridge base and let it sit for a few minutes to help loosen it. If it still doesn't budge, you will likely need to use a gear puller, such as the Arcan Hardened 3 in. Gear Puller AS3GP, to extract it safely without damaging the valve body.

Transcript
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that I was able to use the mo replacement to get this working now one thing of note with the replacement kit I bought on Amazon I noticed between the OEM Mo replacement and the one I bought on the kit the rubber wasn't really staying on the valve super well so that's something to be aware of if you can't get the valve to go in and and out really smoothly then that might cause issues if the rubber kind of becomes undone as you're pushing it in you may end up with the same problem that I had with the poor water pressure so if that's a concern you may want to consider getting the OEM valve replacement from mowing but if the valve is going in and out very smoothly and easily then the replacement in the replacement kit I got works just fine once I got the new valve back in I turn

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