RP50587 Cartridge Valve Replacement for RP50587 Delta Cartri

The Verdict

A dripping Delta faucet is one of those annoyances that starts as a minor irritation and quietly becomes a water-bill leak you can’t ignore. If you’ve already looked up the RP50587 cartridge number, you know the fix is simple — but the choice between OEM and aftermarket isn’t always clear. This replacement cartridge has earned a 4.6-star average across 229 ratings, which suggests it’s doing something right. Here’s what you actually need to know before you buy.

What’s in the box

The package contains the cartridge itself, two rubber O-rings pre-lubricated with silicone, and the plastic retainer clip that locks everything in place. The cartridge body is machined brass with a chrome-plated stem — a solid upgrade over the all-plastic internals you’ll find in some budget replacements. As shown in the product image, the hot/cold indexing tabs are clearly marked, which helps avoid the classic mistake of installing it 180 degrees backward.

Real-world performance

Installation follows the standard Delta procedure: shut off the water, remove the handle and retaining nut, pull the old cartridge with a puller tool, and drop this one in. The critical fit points — the splined stem, the base alignment tabs, and the O-ring groove depth — match OEM specifications closely. Buyers consistently report a snug, watertight seal on the first attempt.

One reviewer noted, “I was skeptical about a non-Delta part, but this thing seated perfectly and the handle feels exactly like it did when the faucet was new.” Another mentioned, “Took about 20 minutes including cleanup. No more drip, and the temperature adjustment is smooth.”

The quarter-turn operation is notably smooth. The ceramic discs inside provide the same friction-free feel you’d expect from a genuine Delta cartridge, with no grinding or catching at the stops.

Where it falls short

The most common complaint in the review history is the retainer clip. Several buyers describe it as “thinner and more flexible” than the genuine Delta piece. In practice, this usually means you need to be more deliberate when snapping it into place — it works, but it doesn’t inspire the same confidence as the OEM part. If you’re a perfectionist, keep your old clip if it’s still in good shape.

The lack of printed instructions is also worth noting. The box is bare-bones. If you’ve never replaced a faucet cartridge before, watch a quick video first — it’s not a hard job, but you need to know the order of operations.

Who should buy this

This cartridge is ideal for DIY homeowners who want to fix a leaky Delta single-handle kitchen or bathroom faucet without paying the OEM premium, which can run two to three times the price. It’s also a smart pick for landlords or property managers who maintain multiple units — the price point makes it reasonable to keep one on hand for emergencies.

Skip it if you’re a professional plumber who needs the absolute certainty of a genuine Delta part on every job, or if you have an older Delta faucet model that uses a different cartridge design entirely — double-check your model number before ordering.

FAQ

Q: Will this fit my Delta faucet? A: It’s designed for the RP50587 and DST systems used in most single-handle Delta kitchen and bathroom faucets manufactured after 2000. Check your faucet model number or pull the old cartridge and compare the shape. If it has the same two-tab base and splined stem, this will work.

Q: Do I need any special tools? A: A cartridge puller tool makes removal much easier, but you can often grip and twist the old cartridge out with pliers if you’re careful. You’ll also need an Allen wrench to remove the handle setscrew and possibly a deep socket for the retaining nut.

Q: How long will this replacement last? A: With normal municipal water, expect 5–10 years of service. The ceramic discs are the wear component, and they’re the same grade used in OEM cartridges. Hard water will shorten lifespan regardless of brand.

The Verdict

Buy it if: You have a leaky Delta single-handle faucet and want a reliable, budget-friendly fix that performs like the original. The fit is accurate, the operation is smooth, and the price is right.

Skip it if: You want OEM certainty above all else, or you’re uncomfortable with a slightly flimsier retainer clip. For most homeowners, though, this cartridge delivers exactly what it promises.

Rating: 4.6/5 — a solid aftermarket replacement that handles the job without drama, with only minor cosmetic-quality compromises holding it back from a perfect score.

Where to Buy

👉 Check Price on Amazon →

We earn a small commission at no extra cost to you — this helps fund more honest reviews.

Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.