General Pump EZ2542S 1/2" BSPP 24mm 4.2GPM 2500PSI - 3020

High-Performance 4.2 GPM Pump for Reliable 2500 PSI Cleaning Power

The General Pump EZ2542S is a triplex plunger pump engineered to deliver 4.2 GPM at 2,500 PSI, making it a go-to choice for professional pressure washing and industrial cleaning applications. Running at a smooth 1,750 RPM with a 24 mm solid right-hand shaft (0.945 in), this pump is purpose-built for direct coupling to standard electric motors, giving commercial users dependable, day-in-day-out performance.

The result is a pump that produces consistent cleaning power with remarkably low maintenance demands. Whether you're outfitting a mobile wash rig, a fixed wash station, or an OEM system, the EZ2542S delivers the durability and output that keeps operations moving.

Why You'll Love the General Pump EZ2542S

Specs tell part of the story. Here's what the EZ2542S actually means for your work.

• Stronger, more consistent cleaning results – With a maximum volume of 4.2 GPM paired with 2,500 PSI of discharge pressure, this pump handles vehicle washing, building cleaning, and industrial wash-down equipment without stalling or losing pressure under load. The higher flow rate speeds up rinse times and improves productivity across every job.

• Lower wear and longer service life – The 1,750 RPM operating speed generates far less heat and internal stress than pumps that need 3,400+ RPM to hit similar pressure. The EZ2542S features solid ceramic plungers for enhanced durability, and its forged brass manifold with a 4:1 hydrostatic rating resists cracking, corrosion, and hydraulic shock over thousands of hours of use.

• Less downtime and easier maintenance – The crankcase is made of anodized aluminum and features a die-cast oil-bath design, holding 14.0 oz of oil with easy-access drain and fill ports. Unitized stainless steel inlet and discharge valves simplify service, keeping your crew on the job instead of in the shop.

• Flexible integration into existing systems – The 24 mm solid shaft mates cleanly with 1,750 RPM electric motors, while the 1/2"-14 BSPP-F inlet and 3/8"-19 BSPP-F discharge ports connect to a wide range of plumbing configurations. At just 18 lbs, the pump fits on skids, carts, and trailers with ease.

• Confidence under demanding conditions – The forged brass manifold is backed by an exclusive lifetime warranty, and the maximum fluid temperature is rated at 165°F, supporting warm-water applications like degreasing, sanitizing, and pre-heated wash loops.

What Makes the EZ2542S Different

Most generic pressure washer pumps rely on cast brass manifolds, run at higher RPMs, and use materials that wear out fast under commercial workloads. The General Pump EZ2542S is built on a different philosophy.

• Forged brass manifold with lifetime warranty – Forged brass is denser and more uniform than cast alternatives, with fewer internal voids and significantly higher resistance to cracking, corrosion, and thermal stress. General Pump stands behind this manifold with an exclusive lifetime warranty-a commitment you won't find on most competing pumps.

• Optimized 4.2 GPM at 1,750 RPM – Many pumps in this flow and pressure class require engine-driven speeds of 3,400 RPM or higher. The EZ2542S achieves its full 2,500 PSI and 4.2 GPM output at just 1,750 RPM, dramatically reducing bearing heat, plunger wear, and seal degradation over the pump's lifespan.

• Engineered for professional-duty cycles – With a minimum horsepower requirement of 7.2 BHP, solid ceramic plungers, premium roller bearings, and a robust oil-bath crankcase, the EZ2542S is designed to handle daily or multi-shift operation-not occasional weekend use. Reviews from professional users consistently highlight General Pump's reliability and nationwide parts availability as key advantages.

How It Works

The EZ2542S is a triplex plunger pump, meaning three ceramic plungers reciprocate inside parallel cylinders to draw water in and push it out at high pressure. The overlapping strokes produce a smoother, more consistent flow with less pressure ripple than single- or dual-piston designs.

1. Install and connect – Mount the pump on a 1,750 RPM electric motor capable of delivering at least 7.2 EBHP. Align the 24 mm solid right-hand shaft with an appropriate coupling. Connect the inlet line to the 1/2"-14 BSPP-F port and the discharge hose to the 3/8"-19 BSPP-F outlet. The bore size is 0.708 inches (18 mm) and the stroke size is 0.612 inches (13 mm), tuned for optimal output at rated speed.

2. Supply water and oil – Provide a clean, filtered water supply at the recommended feed pressure (maximum inlet pressure: 125 PSI). Fill the crankcase with approximately 14.0 oz of oil-GP Series 100 is recommended-and verify the level before starting.

3. Build pressure and clean – Energize the motor. The pump draws water through the inlet valves, pressurizes it up to 2,500 PSI, and delivers a steady 4.2 GPM stream to your spray gun, wand, or cleaning tool. The forged brass manifold ensures stable, leak-free fluid routing under full load.

4. Shut down and protect – Release system pressure before stopping the motor. Inspect for leaks, check the oil level, and protect the pump from freezing conditions when not in use. Proper shutdown preserves seals, plungers, and internal components for maximum service life.

Product Details

A quick-reference specification table for installers, specifiers, and system builders.

• Material / Construction – Triplex plunger design with solid ceramic plungers; unitized stainless steel inlet and discharge valves; forged brass manifold with exclusive lifetime warranty; die-cast anodized aluminum oil-bath crankcase with premium roller bearings. Available in right-hand (solid shaft) and left-hand versions. The pump weighs 18 lbs.

• Performance Specifications – Flow rate: 4.2 GPM - Maximum pressure: 2,500 PSI - Pump speed: 1,750 RPM | Power requirement: 7.2 EBHP - Bore: 18 mm - Stroke: 13 mm

• Connections – Inlet port thread is 1/2-14 BSPP-F and the discharge port thread is 3/8-19 BSPP-F - Shaft size is 24 mm solid shaft for direct coupling to compatible electric motors

• Operating Limits – Maximum fluid temperature: 165°F - Maximum inlet pressure: 125 PSI - Weight: 18 lbs, suitable for fixed skids, carts, and mobile wash rigs

• What's Included – Ships as a bare pump (motor not included). Includes oil drain/fill ports, mounting holes, and manufacturer documentation covering installation and maintenance guidelines. Repair kits and replacement parts (seals, valves, head rings) are available separately.

• Warranty – The forged brass manifold carries an exclusive lifetime warranty against defects in material and workmanship. Remaining pump components carry standard manufacturer warranty coverage.

Who the EZ2542S Is For

Not sure if this pump fits your application? Here's a quick guide.

• Professional pressure washing contractors – The pump is commonly used in commercial pressure washers for exterior cleaning, fleet washing, concrete restoration, and graffiti removal, where 4.2 GPM at 2,500 PSI hits the versatile sweet spot between volume and power.

• Equipment and rental yards – Skid-mounted and trailer-mounted wash units that need a dependable, easy-to-service pump capable of surviving repeated rental cycles without excessive downtime.

• Industrial and facility maintenance teams – In-plant wash stations or fixed cleaning systems running daily at 1,750 RPM. The pump is designed for pressure washing and general cleaning applications, including warm-water setups up to 165°F for degreasing and sanitizing tasks.

• OEM system builders – Manufacturers spec'ing turnkey pressure washer systems who need a proven pump with standardized 24 mm shaft dimensions, BSPP port threads, and strong warranty backing for end-user confidence.

Frequently Asked Questions

Common selection, setup, and maintenance questions about the EZ2542S.

What motor do I need to drive the EZ2542S? You'll need a 1,750 RPM electric motor that delivers at least 7.2 EBHP. Specifying a motor with slightly more capacity (e.g., 8 HP) provides margin for drive losses and startup loads.

Can I run hot or warm water through this pump? Yes. The maximum fluid temperature is rated at 165°F, making the EZ2542S suitable for many warm-water cleaning and degreasing applications within that limit. Exceeding 165°F risks accelerated seal wear.

What inlet and outlet fittings does it use? The inlet port thread is 1/2"-14 BSPP-F and the discharge port thread is 3/8"-19 BSPP-F. If your plumbing uses NPT fittings (common in North America), you'll need BSPP-to-NPT adapters to ensure leak-free connections.

How much oil does the crankcase hold? The crankcase oil capacity is 14.0 oz. General Pump recommends GP Series 100 oil. Check and change oil regularly under heavy-duty usage schedules.

How heavy is the EZ2542S for mounting on a skid or cart? The pump weighs 18 lbs, making it manageable for a single technician during installation and well-suited for mobile equipment frames and trailer builds.

Ready to Build a More Reliable Pressure Washing System?

Stop cycling through underpowered pumps that overheat, leak, or lose pressure when the job gets serious. The General Pump EZ2542S delivers 4.2 GPM at 2,500 PSI from a 1,750 RPM platform backed by solid ceramic plungers, premium roller bearings, and a forged brass manifold with an exclusive lifetime warranty.

Applications include vehicle washing, building cleaning, and industrial wash-down equipment-anywhere consistent commercial-grade cleaning power is non-negotiable. Spec the EZ2542S for your next build or upgrade, and reach out to the Barens team to verify compatibility with your motor, frame, and plumbing layout.