4.2 GPM Watermaker Cat Pump 15.9 LPM 1000 PSI 316 SS Direct Drive

Cat Pumps 316 Stainless Steel Direct-Drive Watermaker Pump (4.2 GPM, 1000 PSI)

Engineered specifically for demanding marine applications, this industrial-duty, direct-drive triplex plunger pump is the premier choice for onboard seawater reverse osmosis (SWRO) systems. Designed as a highly reliable watermaker pump for sailboats, luxury yachts, and long-range cruisers, it features a wetted end constructed entirely of premium 316 Stainless Steel. This high-grade metallurgy ensures maximum structural integrity, exceptional chemical compatibility, and long-lasting durability, providing the essential corrosion resistance required when continuously pumping harsh, high-salinity seawater for offshore desalination.

To help vessel owners easily determine compatibility and seamlessly match this pump to their existing watermaker system, it utilizes a space-saving, hollow-shafted configuration specifically designed to bolt directly to a standard NEMA 56C-face electric motor. By eliminating the need for external belts, pulleys, and mounting plates, this compact direct-drive assembly delivers highly consistent, continuous-duty operation in tight engine rooms. Operating at a standard 1725 RPM, it delivers a precise flow rate of 4.2 gallons per minute (GPM) at a robust test pressure of 1000 PSI. It incorporates advanced, concentric solid ceramic plungers that provide a true, low-friction wear surface, substantially extending the operational life of the standard NBR (Buna-N) seals to ensure mission-critical reliability while at sea.