Pentair Impeller 1 HP | Dynamo Pump — Dynamo Series | 355122Z Diving Board Stands While the valve is disassembled

While the valve is disassembled for shaft replacement

OEM Replacement Skimmer Lid for the Pentair Admiral S20

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

With 146 pleats of 4 oz

Pentair Impeller 1 HP | Dynamo Pump — Dynamo Series | 355122Z Diving Board Stands While the valve is disassembledThe 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