Gusher Urchin Manual Bilge Pump Thru Deck/Bulkhead. Since the 1940s Whale engineers have refined our manual bilge pump designs and completed extended life testing - the result? Whale's iconic manual bilge pump range.. Manufactured by hand using high grade materials and drawing on more than 60 years experience.. Features. Easy of operation - Smooth easy action. Easy maintenance - Clamp ring easily removed for pump head rotation and quick maintenance. Versatility of design - Dual size nozzles for 25 mm (1") or 38 mm (1+") 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). WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.