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Remove 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

After removing the handle, slide the cylindrical chrome sleeve off the valve. This will expose a large brass bonnet nut. Unscrew this nut counter-clockwise. You may be able to do it by hand, but if it is tight, use channel-lock pliers. With the nut removed, grasp the old, broken cartridge and pull it straight out of the valve housing.

Goal: Access valve

  • Be prepared for a small amount of residual water to spill out when the cartridge is removed.

Used in this video

  • Channel-lock pliers · optional — Loosening the bonnet nut if it is too tight to turn by hand.
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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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pop and there she blows so now what we're gonna have is here's the inside and I met this handle this part right here and there's a gray part with his little ring right here that's part of the cartridge so we already know we're going to buy a new cartridge that was being held in that's how this handle connected to his cartridge but now we should be able to move this little dude off and this is was talking about this was the body that's covering there's part of my cartridge too that's covering my cartridge and then next your nut we can hand listen this one sometimes you may need some pliers whenever I take this cartridge out some water may be coming out with it here you should be

Auto-generated transcript. May contain errors.