Diaphragm 0.4 L Bilge Hand Pump (0.1 gal) | 4BoatsCompact diaphragm bilge hand pump delivering 0. 4 L (0. 1 gal) per stroke, ideal as an emergency or backup pump for small boats. Capacity: 0. 4 L per stroke (0. 1 gal) Operation: Manual works without battery power Valve: Built in non return valve Maintenance: Quick release clip for fast access Handle: Two position for ergonomic pumping Outlet: Fits 19 mm or 25 mm (3 4 in or 1 in) hoses Diaphragm bilge hand pump pump unit only Easy to fit and operate;