This self-priming pump can deliver almost 80lbs of water per minute and is reversible to both fill and empty ballast tanks. Run-dry protection shuts off pump before impeller is damaged. Complies with USCG 183.410 and ISO 8846 for ignition protection. Ports: 1/2" NPT internal thread and 1" external hose barb. NOT TO BE USED IN POTABLE WATER SYSTEMS.