This FlowRite replacement cartridge for Moen 1222, 1222b posi-temp single handle tub and shower is a perfect fix to your leaking issues. This kit includes a new retaining clip replacement and plastic cap removal tool. This non-oem cartridge will work with all Moen single handle posi-temp single handle shower/tub valves. If you have an older, difficult, or frozen valve that you may have trouble removing, we also offer a seperate heavy duty cartridge puller that makes the removal task much easier. Its the one the pros use and is made specifically for these cartridges. Every order comes with a set of instruction for ease of installation.