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Extract 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

Use the white plastic tool included with the new cartridge to rotate the old cartridge back and forth, breaking it free from mineral deposits. Then, grip the brass stem of the cartridge with pliers or an adjustable wrench and pull it straight out of the valve body. If it is severely stuck, a dedicated cartridge puller tool will be necessary. After removal, use a flashlight to inspect inside the valve body for any debris or leftover O-ring pieces.

Goal: Remove the old cartridge

  • Wiggling the cartridge while pulling can help ease it out.

Used in this video

  • Adjustable wrench (brand: Unspecified) · optional — Gripping the cartridge stem to pull it out.
  • Pliers (brand: Unspecified) — Gripping and pulling the cartridge.
  • Flashlight (brand: Unspecified) — Inspecting the inside of the valve body.
  • Cartridge Puller (brand: Unspecified) · optional — Removing a cartridge that is stuck.
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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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I think the tile guy gave us a room to work on these. Remove that. Now here's the tricky part. What these are designed to do is you take this and then you just twist it out. Sometimes that works. Sometimes they're stuck. If they're stuck, you're going to need a cartridge puller. I highly recommend investing in one of these if you're going to be working on a lot of these types of cartridges. They're only pretty cheap and they will save you a lot of time. I would like to check back there for sediment build-up or any loose o-rings. We look like we're clear. Our new cartridge comes with some o-ring lubricant. We're going to want

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