My old Price Pfister shower faucet is leaking, so I removed the handle to see what kind of stems they use.
I haven't seen this kind of stems anywhere. Does anyone know what part they are?
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Price Pfister has many valve stems on the market and it would be near impossible to find the exact replacement for your shower with just the pictures you've provided. You're probaby looking for something that resembles the valve stem shown below from Lowes.
You'll need to turn off the water to the shower and remove the stem by turning that nut counterclockwise. Take the stem to your home store or a plumbing supply store and they will be able to match it. If you just need a washer or "o" ring, they'll be able to fix you up.