Pentair Challenger Pinnacle SuperFlo, Impeller Locking Screw, 355389
No.10 Image 355389 Screw, Impeller Locking Used on Pentair Pool Pumps. Fits Challenger, Pinnacle and SuperFlo pumps as the locking impeller screw. Stainless Steel screw prevents impeller from unthreading if backflow occurs. 355389 and other Pentair PacFab pump parts are on schematic diagram in our parts department.