Johnson Pump 1000GPH Ultima Combo Pump 3 4" Hose Dura Port [07903 00] Marine Hardware Chocks these models will interrupt the Paddlesports Roof Rack Systems these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running Box Dimensions: 7"H x 14"W x 17"L WT: 13 The electronic automatic switch Ultima Switch™ uses the patented Mirus field effect detector cells producing micro electrical fields that detect disruptions caused by level of water present in the bilge and automatically activates and deactivates the pump and 1000 GPH pumps have easy to install Dura Port discharge ports to eliminate stress cracking caused by over tightened hose clamps