Pentair 355317 Mount Plate Replacement Specialty and Swimming Pool Inground Pump Mount plate replacement Fits Pentair Challenger high pressure swimming pool inground pumps models CHII-NI-3/4F thru, CHII-NI-3F, CHII-NI-1A thru, CHII-NI-2-1/2A Also fits Pentair WaterFall specialty pumps models AF-75, AFP-75 Measures 7-5/8-inch length by 1/4-inch height by 7-5/8-inch width