This complete system combines SeaLand's TankWatch 4 level indicator, SaniGard vent filter, 12V SaniPump discharge pump and TankSaver vacuum relief valve in one package. It features separate ports for overboard and dockside discharge. The vent filter includes a cartridge that contains odor removing media, lasts one boating season and is easily replaced. The discharge pump is self-priming and can run dry without damage. The vacuum relief valve protects the tank from excessive suction by dockside pumps. Material: Polyethelyne Wall: 5/8" Capacity: 27.5 gal. Port Sizes: Pump: 1-1/2" hose barb. Tank: two 1-1/2" elbows (with sealing grommets) for 1 1/2" hose. Elbows rotate to desired angle. Vent: 5/8" hose barb Dimensions: 19"W x 30"L x 19.5"H Warranty: One year