Freshwater flushing of your inboard is as simple as connecting a garden hose. Transparent body allows for visual inspection of water flow. Durable check valve system activated by water pressure from a garden hose. Check valve automatically shuts off hull intake when pressure is applied. Adapter supplied with FlushProï¾™ makes winterizing your boat easy. Can be used with onboard generators. FlushProï¾™ kit includes: FlushProï¾™ check valve with hose clamps, Perko water inlet fitting (499 DP CHR), 7' length of hose and fittings.