Pentair Impeller Washer | CSPH/CCSPH Series Commercial Pump | 38917-0203 Inlets & Skimmers ⚠️ Compatibility Note

⚠️ Compatibility Note

Buttress threads engage differently from standard pipe threads — they are designed to resist the axial forces exerted by pressurized water against the tank wall

and flush with your pool deck

Pentair Large Concrete Niche 1" Rear Conduit Hub

it delivers consistent water clarity and long-lasting filtration performance across regular spa use cycles

Pentair Impeller Washer | CSPH/CCSPH Series Commercial Pump | 38917-0203 Inlets & Skimmers ⚠️ Compatibility NoteThe Pentair 38917 0203 is the OEM replacement impeller washer for the CSPH and CCSPH Series commercial pumps. The impeller washer seats between the impeller and the pump shaft assembly, maintaining proper axial positioning and protecting mating surfaces from wear under the high torque loads characteristic of large commercial pump operation. A damaged or missing washer can allow impeller movement that accelerates wear on adjacent components and