Clip on base for easy installation and cleaning. Submersible while operating, 12 volt. Maximum head: 2 metres (@ approx 50% output). 1.1/4" (32mm) outlet. 210mm high. 135mm dia base. 18A. For pleasure craft use only. 12 month warranty. gph = US gallons per hour. Outlet size: for 1.1/4" I.D. hose.