2.85 GPM Watermaker Cat Pump 1200 PSI 316 Stainless Steel Direct Drive

CAT Pumps 2.85 GPM Watermaker Pump – 316 Stainless Steel Direct Drive Plunger Pump

This CAT Pumps triplex, positive displacement, reciprocating plunger pump is manufactured by Cat Pumps Corporation, headquartered in Minneapolis, Minnesota, and purpose-suited for watermaker and reverse osmosis desalination systems. Rated for a steady flow rate of 2.85 GPM, it delivers the consistent high-pressure feed required to drive seawater and brackish water RO membranes efficiently, making it a proven choice for marine watermakers, offshore installations, and industrial process water systems.

Constructed with 316 stainless steel manifolds and valve assemblies, this pump is built to withstand the corrosive, high-salinity conditions inherent to seawater desalination. It uses solid ceramic plungers, which deliver a smooth, low-friction wear surface that helps extend the service life of the standard NBR (Buna-N) seals and O-rings, while unique spring-loaded inlet valves and a flow-through plunger design combine to provide steady, consistent flow with minimal pulsation — an important factor for maintaining stable membrane performance in a watermaker system.

This is a hollow-shafted, direct-drive pump designed to bolt directly onto a standard 1725 RPM NEMA 56C-face electric motor, eliminating the need for external belts and pulleys. This compact, direct-drive configuration reduces the pump's overall footprint, simplifying installation in space-constrained equipment skids and onboard marine engine rooms. Rated for a maximum operating pressure of 1,200 PSI, this pump is supplied without an integrated unloader valve, making it well suited for OEMs and system builders integrating their own pressure control components into a complete watermaker package.

Specification Table