Whale Gusher Urchin Service Kit Nitrile Membrane&nbsp;&ndash;&nbsp;59339 Versatility of design -Dual size nozzles for 25 mm (1") or 38 mm (11/2") hose to suit your plumbing Efficient performance - up to 55 ltrs (14.5 US gals) per minute Three different mounting models (deck, bulkhead and thru deck models) Easy maintenance - Clamp ring easily removed for pump head rotation and quick maintenance Smooth easy action