How do I identify my Moen shower valve?

To identify your Moen shower valve, you need to look at visual clues, handle operation, and cartridge shape because Moen has used several different valve platforms over the years. First, look at the handle operation. If your shower has a single handle that you pull out to turn on and rotate to adjust temperature, it is likely a Moen Posi-Temp 1222 valve made after the mid-1980s. If the handle rotates 90 degrees without pulling, it may be an older Moentrol 1200, 1225, or 1224 valve. Second, remove the handle and escutcheon plate to see the cartridge. The Moen 1222 Posi-Temp cartridge is about 4 inches long, plastic with brass, and has a distinctive shape with two tabs. The Moen 1225 is all brass with a single handle stem. The Moen 1200 is similar but with a different seal arrangement. Third, check for model numbers on the escutcheon plate or handle. Sometimes there is a small tag on the valve body behind the wall that can be seen with a flashlight. You can also take a clear photo of the handle, trim, and the exposed valve with the trim removed and bring it to a plumbing supply store or compare it to Moen's identification guide online. If your shower was installed before 1985, it may be a Moen Standard valve. Knowing the valve type ensures you buy the correct cartridge and trim kit.