Non-return 25 mm (1") 90° Check Valve | 4BoatsCompact 90 nonreturn valve with a 25 mm (1") outlet, designed for bilge and discharge hose runs. Outlet 25 mm (1") for standard hose connections 90 angle routes discharge neatly in confined spaces Nonreturn mechanism prevents reverse flow to protect pumps Inline design fits easily into existing hose runs Compact build suitable for underdeck or locker installations Application for bilge and discharge plumbing Includes one Non return 25 mm (1") 90 valve.