Delta Faucet Cartridge | Noels Plumbing Supply Inc

“Hot Water Stem Unit for American Standard Aqua Seal 72950-0700 72950-17” has been added to your cart. View cart

White plastic cartridge with brass stem black oring stainless bottom with black seats and stainless springs.

Scald Guard Replacement Cartridge for Delta 1600 Series Tub and Shower Faucets NRP1991 NRP3560 - Image 2

Scald Guard Replacement Cartridge for Delta 1600 Series Tub and Shower Faucets NRP1991 NRP3560 - Image 3

WHAT OUR CUSTOMERS SAY…

“I was very happy with Noel’s Plumbing. I was searching for a fairly rare part and saw it listed on their website. After placing my order, I was informed that the item was actually on backorder. Noel’s Plumbing was upfront and honest right away, letting me know it might take some time to arrive. Throughout the wait, they consistently kept me updated, which I really appreciated. When the part finally came in, they shipped it out immediately. It arrived exactly as described and was precisely what I needed. Excellent communication, honesty, and follow-through. Thank you, Noel’s Plumbing! ”

-Dave F.

04/04/2026

$35.27

The Delta RP1991 is a replacement stem unit cartridge designed specifically for Delta 1600 Series single-handle tub and shower faucets. It is prominently used in older Scald-Guard plumbing configurations manufactured roughly between 1974 and 1993.

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, noelsplumbingsupply@fuse.net, or via the text widget on this screen.

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Stop annoying faucet drips and restore smooth temperature control with the Delta RP1991 Stem Unit & Seats. Engineered specifically as a replacement part, this assembly is designed for Delta 1600 Series single-handle tub and shower faucets featuring the “Scald-Guard” trim. Whether your older shower valve is leaking, sticking, or struggling to balance hot and cold water, replacing the worn internal stem and seats is the ultimate, long-lasting solution.

NRP1991 NRP3560

Compares to OEM RP1991 RP3560
Use as a generic replacement OEM RP1991 RP3560
2″ length
Oval broach
Includes seats & springs
Replacement part for Old Style 1600 Series Faucets

Related Documents

Delta Model 1600 Series Parts

Customer submitted images.

Common questions about this product

Yes, this aftermarket part will replace your OEM part.

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

We will make sure you have the right part.

WHAT OUR CUSTOMERS SAY…

“I texted him a picture of the shower part from the 50’s I needed and he was able to identify it immediately. I ordered it and it showed up in two days! Very knowledgeable and friendly! ”

-Jim F.

02/04/2026