Cat Pumps
4.2 GPM Watermaker Cat Pump 15.9 LPM 1000 PSI 316 SS Direct Drive
4.2 GPM Watermaker Cat Pump 15.9 LPM 1000 PSI 316 SS Direct Drive
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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.
| Specification | Details | Notes |
| Manufacturer | CAT Pumps | |
| Pump Type | Triplex Plunger Pump | Positive Displacement (Direct-Drive) |
| Manifold Material (Wet End) | 316 Stainless Steel | Exceptional seawater/corrosion resistance |
| Max Flow Rate | 4.2 GPM (15.9 LPM) | |
| Pressure Range | 100 - 1000 PSI | |
| Test PSI (Applied Pressure) | 1000 PSI | Standard SWRO high-pressure operation |
| Max Pump Speed | 1725 RPM | |
| Shaft Diameter | 5/8" (15.9 mm) Hollow Shaft | |
| Motor Mount | NEMA 56C Face | Direct electric motor mount |
| Inlet Port Size | 3/8" NPT(F) | |
| Discharge Port Size | 3/8" NPT(F) | |
| Plunger Material | Solid Ceramic | Low-friction wear surface |
| Seal Material | NBR (Buna-N) | Standard |
| Max Liquid Temp (NBR) | 160°F (71°C) | |
| Primary Applications | Marine Watermakers, SWRO, Desalination | Ideal for sailboats, yachts, and cruisers |
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Product Disclaimer & Limitation of Liability
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