Whale Gusher Titan Manual Bilge Pump combines powerful performance and a light weight in a design that's been tried, tested, and trusted by sailors for decades. Use for bilge pump-out, holding tank pump-out, or toilet flushing. Pump can be mounted on a bulkhead or thru-deck with the included deck plate. Self-priming unit includes a spring-assisted outlet valve and a clamp ring that's easily removed for pump head rotation and quick maintenance. Specifications:• Flow Rates: 18 GPM @ 45 strokes per minute28 GPM @ 70 strokes per minute• Port Size: 1-1/2" Can be mounted on a bulkhead or thru=deck Self-priming unit | Gusher Titan Manual Bilge/Waste Pump