EZ3042S 4,2 GPM 3000 PSI 1750 tr/min 24 mm

Heavy-Duty Cleaning Power at 4.2 GPM and 3000 PSI

The General Pump EZ3042S is a triplex plunger pump designed for high-pressure cleaning applications that demand consistent, day-after-day performance. Part of the EZ Series 44 lineup, this pump delivers a 4.2 GPM flow rate at 3000 PSI - a combination that puts it squarely in the professional pressure washer category for commercial and industrial cleaning tasks.

At 1750 RPM, the EZ3042S runs cooler, quieter, and smoother than higher-speed alternatives, translating directly into longer service life and less operator fatigue. The pump operates at a speed of 1750 RPM, which is the sweet spot for pairing with common electric motors in belt-drive configurations. The EZ3042S features a 24mm shaft size on a solid shaft platform, backed by premium roller bearings, making it ideal for belt-drive or direct-drive integration into pro-grade pressure washer rigs. Pressure washing rigs benefit from the pump's reliability and high-performance capabilities across a wide range of demanding jobs.

What Makes the EZ3042S Different

Most budget pumps that claim commercial-grade performance are built around axial or wobble-plate designs that sacrifice durability and efficiency under sustained load. They're fine for weekend driveway duty, but they'll leave you stranded when you need continuous operation day after day. The EZ3042S is built differently.

• Triplex plunger design for true commercial duty – Three solid ceramic plungers cycling inside a precision-machined manifold, driven by a heavy crankshaft and supported by premium roller bearings, outperform light-duty home-center pumps under extended load in every measurable way. The pump includes unitized stainless steel inlet and discharge valves that resist corrosion and handle harsher water conditions without premature failure.

• EZ Series 44 engineering – The EZ3042S is part of General Pump's EZ Series 44 platform, optimized for 24 mm solid shaft applications with improved volumetric efficiency and a robust crankcase architecture. This isn't a one-off design - it's part of a proven, standardized line with cross-compatible parts and well-documented service procedures.

• Forged brass manifold with 4:1 hydrostatic rating – The brass manifold isn't just corrosion-resistant - it carries a 4:1 hydrostatic safety factor, meaning it can theoretically handle four times its working pressure in static conditions. That kind of margin protects against cracking, water hammer, and the pressure spikes that destroy lesser pump heads.

• Service-friendly construction – Accessible valves and plungers, a split crankcase design, and standardized repair kits make in-house maintenance practical even for small operations. You don't need a factory technician to swap seals or replace valves - basic tools and a parts diagram get the job done.

• Reliable performance at 8.6 EBHP – The pump's brake horsepower requirement is a natural match for commonly available 5–7.5 HP electric motors or comparable belt-driven gas engines. You get an efficient, balanced system without having to oversize the drive or compromise on output.

EZ3042S Pump Details and Specifications

Here are the key specifications for easy reference and system planning:

• Series and type – General Pump EZ Series 44, triplex plunger pump with solid ceramic plungers and premium roller bearings.

• Maximum flow – The EZ3042S pump has a flow rate of 4.2 GPM (15.9 L/min) at rated speed.

• Maximum pressure – The EZ3042S pump operates at 3000 PSI (≈ 207 bar) continuous-duty rating.

• Rated speed – 1750 RPM for full output.

• Bore and stroke – 0.708 in (18 mm) bore and 0.512 in (13 mm) stroke for each plunger.

• Required input power – Approximately 8.6 EBHP; pairs well with common 5–7.5 HP electric motors or larger belt-driven gas engines depending on system design.

• Shaft – EZ3042S features a 24mm shaft size, solid, designed for belt-drive or flexible coupling to a motor or engine.

• Manifold material – Forged brass manifold with 4:1 hydrostatic safety factor for durability and pressure resilience.

• Crankcase – The oil-bath crankcase is made from die-cast, anodized aluminum, with accessible fill and drain ports holding 14.0 fl oz of oil.

• Valves and plungers – The pump includes unitized stainless steel inlet and discharge valves and solid ceramic plungers for corrosion resistance and reduced wear.

• Ports – ½-14 BSPP (female) inlet; 3⁄8-19 BSPP (female) discharge.

• Size and weight – The pump's dimensions are approximately 8.6 x 8.7 x 5.5 inches and weighs around 18 lbs - compact enough for skid-mounted or cart-mounted pressure washer frames.

• Fluid and temperature limits – The maximum fluid temperature for the pump is 165°F. Use clean water with approved pressure washer detergents; very hot water or aggressive chemicals require appropriate seal and head material selection. Maximum inlet pressure is 125 PSI.

• Included components – The pump is supplied as a bare pump assembly, ready to be integrated with mounting rails, pulleys or couplings, unloader, and protection devices chosen for the application.

Frequently Asked Questions

Is 4.2 GPM at 3000 PSI enough for commercial work?

Absolutely. The EZ3042S pump has a flow rate of 4.2 GPM and the EZ3042S pump operates at 3000 PSI, which is more than sufficient for most single-operator commercial jobs - residential driveways, fleet washing, farm equipment, and building exteriors are all well within its capability. Higher GPM models are only necessary if you're running very wide surface cleaners, multiple guns simultaneously, or dealing with extremely heavy buildup that demands more volume.

What kind of motor or engine should I pair with the EZ3042S?

The pump's 8.6 EBHP requirement aligns well with 5–7.5 HP electric motors at 1750 RPM in belt-drive setups, or appropriately sized gas engines in multi-belt systems. Don't undersize the drive power - running the pump underpowered causes overheating, stalling, and premature wear on bearings and seals.

Can the EZ3042S handle warm or hot water?

The maximum fluid temperature for the pump is 165°F, so it handles cold and moderately warm water without issue. For frequent warm-water use, confirm your seal materials are rated for the temperature and consider upgraded seal kits. Extremely hot water applications above the rated limit require different pump configurations entirely.

What happens if the pump runs dry?

Running any triplex pump without water is a fast path to expensive damage. Heat builds instantly without the lubrication and cooling that water provides, scorching seals, cracking ceramic plungers, and warping the manifold. Always ensure a flooded inlet, a vented tank, and proper priming before starting the motor.

How difficult is it to service the EZ3042S?

The EZ3042S is designed with accessible valves and plungers, and most routine work - oil changes, seal replacement, valve swaps - can be done with basic hand tools. OEM repair kits, diagrams, and parts support are widely available through General Pump distributors and pressure washer supply outlets. Customer review feedback consistently highlights the pump's straightforward serviceability as a major advantage. If you have questions about specific parts or compatibility, most suppliers can help you find the right kit for your pump's serial number.

Ready to Put the EZ3042S Pump to Work?

Stop settling for pumps that can't keep up with the demands of real commercial work. The EZ3042S delivers 4.2 GPM at 3000 PSI, runs at a durable 1750 RPM, and uses triplex construction with forged brass and ceramic internals - all in a compact 18-pound package that fits standard skid and cart mounting.