Pentair Impeller 1 HP | Dynamo Pump — Dynamo Series | 355122Z Diving Board Stands Measure your existing cartridge and

Measure your existing cartridge and confirm it matches: 21 5/16" length × 5 5/16" outer diameter × 2 1/8" inner diameter before purchasing

When replacing this nut

confirm your existing light niche size and the cord length required for your installation — measure the distance from the niche to the junction box along the actual cord path

Refer to your filter's parts diagram to confirm which item numbers correspond to your specific service need before ordering

While the valve is disassembled for shaft replacement

Pentair Impeller 1 HP | Dynamo Pump — Dynamo Series | 355122Z Diving Board Stands Measure your existing cartridge andThe Pentair 355122Z is the OEM replacement 1 HP impeller for the Dynamo aboveground swimming pool pump. If your Dynamo pump has lost prime, is running loud, or is delivering noticeably reduced flow, a worn or damaged impeller is one of the first components to inspect. What It Does The impeller is the rotating component inside the pump volute that draws water through the strainer housing and drives it through your filtration system. A cracked, worn, or