Pentair Optiflo Pool Pump Replacement O-Ring Kit Pentair Optiflo Pool Pump Replacement O-Ring Kit Kit includes Housing O'ring, Lid O'ring, Diffuser O'ring, Shaft Seal, 2-Drain Plug O'ring you get, #2, (2)#6, (2)#4, #13 in diagram shown in ad fits Pentair Optiflo Pump - 3/4 to 1 1/2 HP pumps