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Remove the Old Cartridge — Remove and Identify the Old Cartridge

Beginner3 hours

Part of project

How to Identify and Replace Your Delta Monitor Shower Cartridge (Old vs. New) · Step 4 of 7

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In this video

Using your fingers or a pair of pliers, pull the U-shaped retaining clip straight up to release the cartridge. Fit the Moen cartridge puller tool onto the cartridge stem and twist it back and forth to break the seal. Once loose, use channel-lock pliers to grip the cartridge stem and pull it straight out of the valve body.

Goal: Extract the faulty cartridge from the valve

  • The cartridge may be stuck tight. Pull straight out without wiggling too much to avoid breaking it inside the valve body.

Used in this video

  • Cartridge puller (Size/Type: Cartridge puller, brand: Moen) — Loosening and twisting the seized cartridge
  • Pliers (Pliers_Type: Channel-Lock, Grip: Textured) — Gripping the cartridge stem to pull it out of the valve body
  • Pliers (Pliers_Type: Needle-Nose) · optional — Removing the cartridge retaining clip
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FAQs

How do I confirm if I need the older gray RP19804 or the newer white RP46074 Delta cartridge before I start disassembly?

While some Delta handle styles can offer clues, the most reliable method is to remove the handle and trim plate to visually inspect your existing cartridge. Note its color (gray or white) and any distinguishing markings or numbers to ensure you purchase the correct replacement part.

The project lists several tools; which are absolutely essential for a successful cartridge replacement, and can I use basic alternatives?

You'll primarily need slip-joint pliers or Channel Locks for gripping the bonnet nut and a Phillips head or flat head screwdriver for the handle and trim screws. While specialized tools are listed, basic versions of these are often sufficient. Ensure your chosen pliers can provide a secure grip without damaging plastic components.

What should I do if I can't locate my main water shut-off valve, or if the water doesn't completely stop flowing after I turn it off?

First, check for an individual shut-off valve to your bathroom or shower, often found behind an access panel. If no such valve exists and the main shut-off is inaccessible or faulty, it's best to contact a professional plumber to avoid water damage and ensure a complete water stoppage before proceeding.

I've replaced the cartridge and reassembled everything, but the shower still drips, leaks, or has reduced flow. What could be the issue?

Double-check that the new cartridge is fully seated and properly oriented; the 'H' and 'C' markings usually align with the hot and cold lines. Ensure the bonnet nut is tightened securely, but not overtightened, and verify that all O-rings are in place and adequately lubricated with plumber's grease.

Transcript
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doesn't break off inside the valve. If that happens, which in my area you have about a 50-50 chance, it can be a pain to get out. For now, I just have this cheap mowing cartridge removing tool from Home Depot. I am planning on eating a new one soon though. This shower valve was not that old, so the cartridge was easy to remove and the inside of the valve looked to be in good condition.

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