ON Valve Return Pump Pump - Bilge Pumps - Accessories for Bilge Pumps - No Return Valve Jabsco non-return valves fit in a pump's suction hose to aid priming and prevent backflow of water into the bilges. • Available for three hose sizes-3/4 ", 1" and 1-1/2 "• Simply Fit Into Hose Hose . • Corrosion-resistant MATERIALS THROUGHOUT. Art.-No. Hose Connector JP29295-1011 19 mm (3/4 ") JP29295-1000 25 mm (1 ") JP29295-1010 38 mm (1-1/2 ")