The gray water tank is designed to be used as collection tank for waste water from showers, sinks, etc. with 3/4", 1" and 1-1/2" inlet ports, and 3/4" and 1" outlet ports. Includes an Ultima Switch for automatic operation and is easy to connect to any 12V/24V pump up to 20 amp. The tank is prepared for Viking Power 16 pump with pre-drilled holes.