Integration of the patented Ultima "field effect" sensing technology into the bilge pump body creates a sleek, reliable, compact unit ready to install and run. UltimaBilge 600GPH-100 GPH, have Dura-Port discharge ports, both a straight and 90 degree smooth elbow. 1250 GPH have threaded 1 1/4" & 1 1/8" discharge port. All versions are delivered with a removable check valve.