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Replace cartridge — Install the New Delta Faucet

Beginner3 hours

Part of project

Delta Shower Faucet Installation & Upgrade Guide · Step 4 of 5

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In this video

Remove and replace the cartridge. Install the new Delta cartridge (RP50587) into the faucet body, ensuring it is properly aligned. Reassemble all parts in reverse order.

Goal: Fix the dripping faucet.

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Lowe's Home Improvement

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FAQs

How do I ensure the water is completely off before I start the installation?

Locate the main water shut-off valve for your home or the specific shut-off valves for the bathroom. After turning them off, open the existing shower faucet handles to release any remaining pressure and confirm water flow has stopped. This prevents unexpected gushes and makes the job cleaner and safer.

Besides a screwdriver and pliers, what other tools might I need for removing my old faucet or installing the new Delta one?

You might need an Allen wrench (often included with new faucets or for old handle removal), a utility knife for cutting caulk/sealant, and plumber's tape (Teflon tape) for threaded connections. A basin wrench can sometimes be helpful for tight nuts, though less common for shower valves.

What are the most common reasons for leaks after installing a new Delta shower faucet, and how can I prevent them?

Leaks often occur due to improperly tightened connections, missing O-rings, or incorrect cartridge seating. Ensure all threaded connections are hand-tightened, then given a quarter to half turn with a wrench, using Teflon tape on male threads. Double-check that the cartridge is fully inserted and secured according to Delta's specific instructions.

Is the 3-hour estimated time realistic for a beginner, or should I budget more time, especially if removing an old faucet?

While 3 hours is achievable for a straightforward replacement, beginners should budget 4-6 hours. Removing an old, corroded faucet can take extra time and effort if screws are seized or old caulk needs extensive cleaning. Always allow buffer time for unexpected issues.

Transcript
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See? Set that aside. And here is the cartridge that we're going to replace. So there's the old one. And here's the new one in the box. RP50587. I'll put a link in the description below. So there's a couple of little knobs on the bottom. They fit into these two holes. Okay, so you can't really goof it up like that. Boma. Make sure you get in those holes. Put the cap back on. Then I'm going to tighten that up a little bit with a wrench. Snap the little cap back in. Turn the water back on.

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