That appears to be a Price Pfister tub/shower valve.

Note 1- there are wayyyy more manufacturers/brands than just P.P. and Gerber. And each manufacturer has many (many many) different styles/models/types.

Note 2- it is not just the "stem" that the manufacturer/brand (and style/model/type) applies to; the whole valve assembly is manufacturer/brand-specific.

Note 3- while stems and trim are generally manufacturer/brand-specific and not interchangeable, this particular brand and model is pretty common (at least in the U.S.) and replacement parts are widely available from both the original maker (P.P.) and from others.

Note 4- I highly recommend that you remove the stems and bring them with you when you go to the plumbing shop to get the parts you need.

Answer from Jimmy Fix-it on Stack Exchange
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Guillens
guillens.com › JER › pdf › OEM_Generic_Faucet_and_Shower_Valve_Cartridge_Easy_Quick_Search.pdf pdf
OEM and Generic Faucet & Shower Valve Cartridge Easy ...
NEW Nov 2021: Online faucet stem broach or spline identifier gauge tool in pdf ... This page is Under Constant Construction. Over 6,000 products and over 200 Brands of OEM and Generic for you to choose the desired ... Note: After the initial filtering, you filter on "Used on" to a Brand and nothing shows it means that the ... Quick and easy way to identify plumbing faucet parts for the kitchen, lavatory, bidet, bar and tub and shower valves.
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Reddit
reddit.com › r/plumbing › shower stem identification
r/Plumbing on Reddit: Shower stem identification
June 9, 2023 -

Hi all! New here so sorry if I’m using the wrong terms, etc. Please correct me.

Photos: Left is the shower stem. Right is one of the hot / cold stems.

Working on stopping a drippy bath / shower spout. I pulled the stems to find replacements at Lowe’s / Home Depot, but no luck. The old ones seem a little fatter and with threading in different spots. I’m pretty certain it’s the stems because tightening the old ones does seem to effect the flow of the drip (although doesn’t stop it outright). The make of the tub is Central. Not certain of the year (over 25 years old).

What’s the best way of finding matches for these stems? Or am I overthinking it? Can I just use newer stems with different knobs, etc?

Happy to just be pointed in the right direction. Thanks!

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Equiparts
equiparts.com › faucet-cartridge-and-stem-quick-guide
Faucet Cartridge and Stem Quick Guide – Equiparts
In some shower applications, stems also divert water from the spout to the shower head. Although cartridges and stems are two different parts, they both do the same thing, just in different ways. In this article, you will learn how to identify which stem or cartridge you need, what signs indicate you need to replace it, the different types of faucet stems and cartridges, the different types of shower cartridges, and how to find and order replacement stems and cartridges.
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Leaky Faucet Guide
leakyfaucetguide.com › home › stem and cartridge finder
Stem and Cartridge Finder Tool Online - Leaky Faucet Guide
August 19, 2020 - Dealing with a Leaky Faucet? Welcome to the Faucet Part-Finder where finding the "Right Part" to your faucet is a Snap · Take a picture of the part with your phone
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Faucetdoctorsuperstore
faucetdoctorsuperstore.com › partscatalog › pdfandimages2 › internalfaucets.pdf pdf
216 internal faucet repair Cartridges, stems and kits
Lavatory, Kitchen, Tub & Shower · For · American Standard · (855-17) AQUAseal · 9/16" Long, 15/16" diameter · One per bar coded display bag · • · • · Item # Description · Price · Stock · 21-516 · *Generic Locknut Only · 4.11 · For · American Standard · LAVATORY & KITCHEN · (29304-02) * Not available from · American Standard · Item # Description · Price · Stock · 26-826 Generic CP Stem w/Bushing ·
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Factory Direct Plumbing Supply
fdsupply.com › category › stems_by_length
Factory Direct Plumbing Supply | Find Stem or Cartridge By Length | Factory Direct Supply
Tired of searching through thousands of faucet stems and cartridge, but you still can't find the correct one that looks like your old leaky faucet stem? Search through thousands of faucet stems and cartridges quickly by filtering them by length.
Find elsewhere
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YouTube
youtube.com › watch
Faucet Stem and Cartridge Identification and Replacement - YouTube
As a commercial distributor of commercial stems and cartridges, we got a lot of questions about replacing them. Watch this video with Alex from our Manassas ...
Published   June 25, 2025
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Steelcase
educationsurvey.steelcase.com › chart › shower-stem-identification-chart.html
Shower Stem Identification Chart - Educational Chart Resources
June 8, 2023 - A shower identification chart is another way of identifying the type of shower faucet you have. Count or use a broach gauge to determine spline count. Just snap a picture of the part and get a recommendation for the replacement part.
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Faucetpartsplus
faucetpartsplus.com
www.faucetpartsplus.com
Faucet Parts Plus is your one stop shop for faucet parts.
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Terry Love
terrylove.com › home › forums
Stem Cartridge Identification Help
Terry Love Plumbing Advice, Remodel DIY & Professional Forum. The best plumbing forums in the USA and Canada. A place for home owners to ask questions and for professionals to share information.
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Tmssouth
tmssouth.com › downloads › Stem_ID.pdf
Tmssouth
Javascript is disabled on your browser. To view this site, you must enable JavaScript or upgrade to a JavaScript-capable browser · Skip to main content · Request a Quote · Quick Order · Back to Top
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Danco
danco.com › home › repair parts › faucet repair parts › faucet stems
Faucet Stems - Danco
X Find stem and cartridge sizes with the StemFinder™ Find the perfect part for your next project. At Danco, we can help make life simpler by providing you with over 2,000 plumbing repair parts. Start now and explore our solutions. Leaky Faucet Guide Tool. Just snap a picture, Find the right part in a few easy steps.
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Reddit
reddit.com › r/plumbing › faucet stem (tub/shower) identification.
r/Plumbing on Reddit: Faucet Stem (Tub/Shower) Identification.
October 6, 2022 -

I need help identifying some parts. While I can rebuild the hot and cold side, I need to replace the diverter. There are no brand markings on these parts, and there is no access to the rear of the faucet.

The hot and cold side have threaded broach ends, something I've very rarely seen. The diverter broach is splined, but it was heavily corroded, and the splined end snapped off in the handle, getting an accurate spline count isn't possible.

I've sifted through photos and catalogs, I'm at a loss. I'd rather not replace the faucet, as this will involve removing the wall, or yanking out/cutting kitchen cabinets...

The home was built in 1953, and is located in NY.

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DEA Bathroom Machineries
deabath.com › how-to › how-to-correctly-measure-your-faucet-stem
How to Correctly Measure Your Faucet Stem – DEA Bathroom Machineries
Things you will need (other than ... or a good measuring tape. 1. Look for markings on your sink or shower that will ID the brand-look under the sink or on the overflow cover of the tub....
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Moen Solutions
solutions.moen.com › article library
Faucet Cartridges: Shower - Moen Solutions
December 6, 2022 - How to identify which cartridge your Moen one, two or three handle bathroom tub and/or shower uses by handle operation and color images of the various cartridges.