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 ExchangeThe Home Depot
homedepot.com › diy projects & ideas › home decor ideas › bathroom ideas & projects
Types of Shower Valves - The Home Depot
September 7, 2023 - This guide reviews the different types of valves for controlling water pressure and temperature in the shower.
The Shower Head Store
theshowerheadstore.com › home › blog › types of shower valves explained: ultimate guide
Types of Shower Valves Explained | HammerHead® Showers
3 weeks ago - Choose the right valve kit and you set yourself up for a long-lasting, frustration-free shower. Choose the wrong one and you might be dealing with leaks, uneven temperature, or expensive repairs later on. In this guide, you will get a clear, straightforward breakdown of the most common types of shower valves, what each one does, and how to avoid the mistakes that cause homeowners the most trouble.
Shower stem identification
Haven't dealt with these in years but it could be just the rubber gasket on the end. They make ones that rotate instead of fixed ones with a screw. Don't forget the seat inside the valve. You need special wrenches to pull them. Soak them well with PB blast as they can be problematic. https://www.parksupplyofamerica.com/site/images/Item_Images/01046308_01.jpg?resizeid=3&resizeh=600&resizew=600 More on reddit.com
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June 9, 2023plumbing - Can someone identify these shower stems & handles? - Home Improvement Stack Exchange
I believe there are two types of stem designs, Pfister and Gerber? If yes, can anyone help me identify which one these are based on the photos below? Thanks ... That appears to be a Price Pfister tub/shower valve. More on diy.stackexchange.com
Is there an easy way to tell what shower cartridge you need by just looking at the end that sticks out the wall?
Agreed it's a pain to verify, I wrote the part number on the back of the wall plate after replacing mine last week. But if it's a faucet from a major brand, it might be on their website. It seems like each one only has a few different sizes. More on reddit.com
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December 9, 2022Need help identifying old shower valve stems...it's likely an original fixture for the 1950's.
That's an American Standard unit. There's a barrel still in your valve body. More on reddit.com
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March 10, 2023Videos
11:58
HOW TO IDENTIFY OLD TUB/SHOWER VALVES FOR PLUMBING REPAIR - YouTube
05:47
Identifying Stems Video - YouTube
09:01
Faucet Stem and Cartridge Identification and Replacement - YouTube
07:36
Ultimate Guide: Choosing the Right Shower Valve - YouTube
04:45
The Difference Between a Faucet Stem and Cartridge | Plus Know ...
Vevano
vevano.com › blogs › bathroom-resources › shower-valve-types
Shower Valve Types 101 — How to Choose the Right Shower Valve
December 4, 2021 - Shower Valve Types 101 — How to Choose the Right Shower Valve December 5, 2021 By Mikael Short The shower valve plays a big role when it comes to your showering routine. The showerhead may be where water flows from, but the shower valve controls the water pressure and temperature to ensure ...
Danco
danco.com › home › repair parts › faucet repair parts › faucet stems
Faucet Stems - Danco
Discover top-quality faucet stems, shower stems, and shower stem replacements at Danco. Explore our Repair Parts category, your trusted source for premium plumbing repair and replacement parts. Elevate your home improvement projects with Danco's reliable and durable solutions.
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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Haven't dealt with these in years but it could be just the rubber gasket on the end. They make ones that rotate instead of fixed ones with a screw. Don't forget the seat inside the valve. You need special wrenches to pull them. Soak them well with PB blast as they can be problematic. https://www.parksupplyofamerica.com/site/images/Item_Images/01046308_01.jpg?resizeid=3&resizeh=600&resizew=600
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Those are Central brand. Search CE-12 for the diverter and CE-8 for the stems. Hot and cold are the same. You will also want to replace the seats behind the stems, the diverter uses a different size seat than the hot and cold.
Moen Solutions
solutions.moen.com › article library
Faucet Cartridges: Shower - Moen Solutions
December 6, 2022 - The guide below will help to identify which Moen cartridge your shower uses. Preparation: The water supply shut off valves must be turned off- see article · How to Turn Off the Water Supply to the Faucet. For warranty information, see article How to Identify if My Product is Warrantied. For additional information on Moen products visit solutions.moen.com and select the type of product you are repairing.
DEA Bathroom Machineries
deabath.com › home › faucet parts › stems and cartridges
Stems And Cartridges – DEA Bathroom Machineries
(209) 728-2031 · My Account · Product has been added to your cart · Antique Plumbing Fixtures · Obsolete Plumbing Parts and Faucet Restoration · Stems And Cartridges · Showing 1–48 of 109 results · Standard Shelf Back Stem, 1/2″ Long Thread on Bonnet Nut · $51.00 Select options ...
KOHLER
kohler.com › home › showers
Shower Valves & Trim | KOHLER
While shower valves do all the work, trim pieces are what you’ll see and use to control water flow and temperature. KOHLER valve trim and handles are available in a range of finishes, like chrome, nickel, brass, and more.
JustAnswer
justanswer.com › plumbing › gbzby-need-help-identifying-shower-valve-stems-so.html
Identify Shower Valve Stems: Expert Help & Guide
March 15, 2021 - Valve stems often differ in diameter and threading, causing rebuild kit incompatibility and leaks. To identify your shower valve stems, first remove the handle and escutcheon plate. Measure stem diameter and check for threading or smooth surfaces. Non-threaded stems require specific rebuild kits designed for slip-on or press-fit types...
The Shower Head Store
theshowerheadstore.com › home › blog › essential features for all shower valve types
Essential Features for all Shower Valve Types
August 10, 2025 - Whether you’re designing, remodeling, or dealing with an unexpected shower valve replacement, read on to discover our list of the top features for all shower valve types.
Equiparts
equiparts.com › faucet-cartridge-and-stem-quick-guide
Faucet Cartridge and Stem Quick Guide – Equiparts
August 10, 2022 - Commercial facilities usually don’t have to worry about anti-scald at the point of the faucet because the water is already tempered. Old Style – Old style shower cartridges had a balancing spool that was separate. New Style – New style shower cartridges all have pressure balancing built in. Thermostatic Shower Valve – Thermostatic shower valves have a built in thermostatic mixing valve. We have been identifying faucet stems and cartridges for over 50 years.
Pfister Faucets
pfisterfaucets.com › parts-support › replacement-parts › product › cartridge-9103850-diverter-stem-for-multi-handle-tub-shower-valves
Genuine Replacement Part 910-3850 Diverter Stem for Multi Handle Tub Shower Valves | Pfister Faucets
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.
Plumbing Forums
plumbingforums.com › general plumbing discussion › showers & tubs
Help with identifying shower valve stem | Plumbing Forums - Professional & DIY Plumbing Forum
July 3, 2011 - This was probably the initial valves which means it was installed in the early 80's. Anyhow, can anyone assist with identifying this valve stem? For some reason, I think it's a Gerber. The only reason I think that was because I saw a Gerber stem in the catalog at Home Depot which had a 34...
Reddit
reddit.com › r/homeimprovement › is there an easy way to tell what shower cartridge you need by just looking at the end that sticks out the wall?
r/HomeImprovement on Reddit: Is there an easy way to tell what shower cartridge you need by just looking at the end that sticks out the wall?
December 9, 2022 -
Maybe I am just talking out my ass but why must they make it so difficult to identify by making you to turn off the main water and removing the part to find the number or taking it to Home Depot to match when they can just simply put a model number on the stem end for anyone to see??? It would be so much easier to order the part or at least check inventory status for the closest supply store before having to remove the whole cartridge.
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Agreed it's a pain to verify, I wrote the part number on the back of the wall plate after replacing mine last week. But if it's a faucet from a major brand, it might be on their website. It seems like each one only has a few different sizes.
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Mine is moen brand (it’s marked on the shower handle). Google took me to a page on their website that shows they have 3 different styles and how to tell them apart. For moen, you could tell by the location of the screw holes. I’m not sure if other brands are similar.
Plumber Star
plumberstar.com › ultimate-guide-to-stem-faucets
Ultimate Guide to Stem Faucets - Premium Residential Valves and Fittings Factory
October 11, 2024 - They come in different types, including seat-and-washer, cartridge, and diaphragm faucets. Choosing the right stem faucet involves considering materials, durability, and design features to ensure efficiency and long-term performance in both ...
Bostingner
bostingner.com › blogs › what type of shower valve do i have?
What type of shower valve do i have? — Bostingner
December 4, 2023 - Pressure balancing valves are suitable for use with up to one or two shower heads as they come with a standard size ½ inch water inlet. As for larger showers with more shower heads and body sprays, you’ll need a different valve type because this ain’t gonna cut it.
Terry Love
terrylove.com › home › forums
Upgrading shower stems from compression to quarter-turns
May 9, 2015 - 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.