340 Cat Pump 4 GPM / 15.1 LPM , 1800 PSI , 1/2" NPT(F) Inlet Port Size , 3/8" NPT(F) Discharge Port Size , 1725 RPM Belt, Clutch, Flexible Coupling and Bellhousing Drive Type(s) , Brass 5 Frame Plunger Pump

Cat Pumps 340 Brass Triplex Plunger Pump (4.0 GPM, 1800 PSI)

For heavy-duty pressure washing, self-service car wash bays, and rigorous commercial cleaning applications, consistent high-pressure fluid delivery and structural reliability are essential. The Cat Pumps 340 is an industrial-grade, 5-frame triplex positive displacement plunger pump engineered for continuous-duty liquid transfer in demanding environments. Constructed with a high-strength chrome-plated forged brass manifold and precision-machined 304 stainless steel valve assemblies, this pump provides exceptional durability and resistance to manifold washout. This robust build makes it a proven, high-efficiency solution that is specifically tailored and highly popular for commercial pressure washers and continuous-duty washdown systems.

Inside the wet end, this pump utilizes high-density, polished solid ceramic plungers that offer a true, concentric wear surface. This low-friction design significantly minimizes heat generation, maximizing the lifespan of the standard NBR (Buna-N) seals and ensuring reliable operation during intense duty cycles. Delivering a smooth, low-pulsation output, the 340 provides a highly consistent flow rate of 4.0 gallons per minute (GPM) at a maximum operating test pressure of 1800 PSI. Driven at an optimal, corrected speed of 1725 RPM, it features a heavy-duty die-cast aluminum crankcase with a splash oil-bath design for supreme internal lubrication. Equipped with standard 1/2" NPT(F) inlet and 3/8" NPT(F) discharge ports, it easily accommodates versatile drive setups, including direct-drive (via bell housing and flexible coupling), clutch, or traditional belt-and-pulley configurations.