Self priming foot pump. Suitable for fresh and saltwater. Designed for neat, thru-floor mount. Plunger locks down flush with the floor when not in use. Comfortable for bare foot use. Easy, smooth action. Can be used to prime Whale-In-Line booster pumps. Hose size 1/2", Service kit AK1304 Maximum priming height 7 ft. Made of acetal, nylon polypropylene neoprene, nitrile rubber, phosphor bronze and stainless steel.