Grey Waste Tanks with Intelligent ControlRobust compact tanks with multi-port options to suit your installation.Whale's Largest Range of Multi-Port Grey Waste Tanks Ever!Simple system - Allows you to manage all grey waste on board through one thru-hull fitting.. Resilient polyethylene one-piece moulded tanks designed to handle grey waste on board - ideal for use with Gulper Grey Waste pumps for unbeaten debris handling.. 8 liter capacity grey waste tanks - compact design allows you to mount a Gulper pump directly to the side to save space and simplify pipe runs.. 16 liter capacity grey waste tanks - higher capacity design allows you to mount a Gulper pump directly to the side to save space and simplify pipe runs.. 20 liter capacity grey waste tanks - outlet ports and sensor locations minimize air pumping noise.. Grey waste tank lid with fully integrated sensor:. Intelligent Control - sensor activates pump automatically to empty grey waste tank only when required. Robust - enclosed hous