Cat Pumps
4.2 GPM Watermaker Cat Pump 15.9 LPM 1200 PSI 316 Stainless Steel 1725 RPM Direct Drive 3/8" NPT(F) Inlet & Discharge Port Size
4.2 GPM Watermaker Cat Pump 15.9 LPM 1200 PSI 316 Stainless Steel 1725 RPM Direct Drive 3/8" NPT(F) Inlet & Discharge Port Size
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Cat Pumps 316 Stainless Steel Direct-Drive Watermaker Pump (4.2 GPM, 1200 PSI)
Engineered specifically for demanding marine applications, this commercial-grade, 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 specialized "wet end" constructed entirely of 316 stainless steel, encompassing both the manifold and valve assemblies. Unlike standard forged brass pumps, this high-grade stainless steel construction provides the essential structural integrity, longevity, and extreme corrosion resistance required when continuously pumping harsh, high-salinity seawater for offshore desalination.
To help vessel owners seamlessly match this pump to their existing watermaker system, it is built to mount directly to a standard NEMA 56C face electric motor via a 5/8-inch hollow shaft. Operating at a standard 1725 RPM, this compact positive displacement pump delivers a highly consistent flow rate of 4.2 gallons per minute (GPM) at a robust test pressure of 1200 PSI. It integrates a lightweight aluminum crankcase to effectively dissipate heat in tight engine rooms, along with solid ceramic plungers that minimize friction to significantly extend the lifespan of the standard NBR (Buna-N) seals. Furthermore, this specific model features a specialized internal design that reduces operating sound levels by up to 6 decibels, making it an exceptionally quiet solution for indoor or noise-sensitive marine installations.
| 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 |
| Valve Material | 316 Stainless Steel | |
| Crankcase Material | Aluminum | Heat dissipation |
| Plunger Material | Solid Ceramic | Low-friction wear surface |
| Seal Material | NBR (Buna-N) | Standard |
| Max Flow Rate | 4.2 GPM (15.9 LPM) | |
| Pressure Range | 100 - 1200 PSI | |
| Test Pressure (Applied) | 1200 PSI (83 bar) | High-pressure SWRO operation |
| Max Pump Speed | 1725 RPM | |
| Shaft Diameter | 5/8" 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) | |
| Max Liquid Temp (NBR) | 160°F (71°C) | |
| Sound Reduction | -6 dBa | Quiet operation for vessel interiors |
| Primary Applications | Marine Watermakers, SWRO, Desalination | Ideal for sailboats, yachts, and cruisers |
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