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Remove Bonnet Nut and Old Cartridge — Remove the Bonnet Nut

Beginner3 hours

Part of project

How to Identify and Replace Your Delta Monitor Shower Cartridge (Old vs. New) · Step 3 of 7

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In this video

Unscrew the large chrome or brass bonnet nut that holds the cartridge assembly in place. It may be hand-tight, but if not, use channel-lock pliers to loosen it. Once the nut is off, you can pull the plastic ball cartridge straight out.

Goal: Remove the retaining nut and the old ball cartridge.

Used in this video

  • Channel-Lock Pliers (brand: Unspecified, Tool Type: Pliers, Pliers Type: Channel-lock) · optional — Loosening a stuck bonnet nut.
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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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Locked it They're not all gonna be in the tight guys that's what the channel locks you for Boom Pull up the cartridge Boom that's the cartridge ball style

Auto-generated transcript. May contain errors.