Reef Octopus OCTO VarioS 6S DC Skimmer Pump Replaces the Diablo 5500S Controllable RO-DC Skimmer Pump (RODC-5500S). Does not include the adapters. Output union size: 1.25" female PVC. Inlet size: 1.25" venturi. Dimensions: 5.11"(W) x 5.7"(L) x 4"(H) Voltage: DC 36V Max Flow Rate: 528gph