Utilizing reversible flexible impeller pump technology, the Jabsco 18670-9407 Ballast Pump is designed to fill and empty the ballast system on your wakeboard or ski boat. This Jabsco pump comes standard with a green run-dry impeller and has the standard electrical quick connector already installed. Just connect your hoses, mount the pump in the boat, plug the power leads together, and you're ready to surf and wakeboard.• Outside of ports accept 1" inside diameter hose• Ports feature 1/2" female NPT• For best results use with 1" inside diameter hose• Do not use with hose that has an inside diameter smaller than 3/4"• Ignition-protected â complies with USCG 183.410 and ISO 8846• Complies with ISO 8849 bilge pump standards• Bronze bodied, flexible impeller design so debris isn't a problem• Equipped with a green Run-Dry Impeller (6303-0007-P)• Includes MasterCraft OEM ballast pump connector• Direct plug and play replacement for MasterCraft 300249SpecificationsFlow Rate: 8.4 GPM (at 10' of head)Voltage: 12V DCRecommended Fuse: 20ADimensions: 7-1/8" x 4-3/4" x 3-1/2"Rated for continuous dutySelf-priming up to 8' Bronze bodied with flexible impeller design so debris isn't a problem Outside ports accept 1" inside diameter hose Includes MasterCraft OEM ballast pump connector | 18670-9407 Self-Priming 8.4 GPM Ballast Pump in Green