W4443VRT — Bertolini VRT Package | 4400 PSI | 4.3 GPM | Industrial Unloader | 1″ Hollow Shaft

The W4443VRT is the fully plumbed, industrial-duty package build of the Bertolini W4443 — a professional-grade triplex ceramic plunger pump WSHPWR bench tested, pre-lubricated, and shipped as a complete pressure system ready to mount. Every component in the W4443VRT — the pump, the VRT3-310A external bypass unloader, the thermal relief valve, the bypass recirculation loop, and all fittings — is factory-plumbed, pressure-set, and WSHPWR bench tested before shipment. This is not an assembly kit. When the W4443VRT arrives, it is ready to bolt onto your engine, connect your water supply, and operate at 4400 PSI from the first startup.

What’s in the Box

• SAE J609-1″ Flange with 4-Bolt and Lock Washer Kit — Everything needed for a seamless, rattle-free installation directly to your engine. Grade hardware included — nothing to source separately.
• Bertolini W4443 Triplex Ceramic Plunger Pump — WSHPWR bench tested and pre-lubricated with break-in oil. Bronze connecting rods, solid ceramic plungers, forged brass manifold with increased wall thickness, AISI 316 stainless steel valve assemblies, dual redundant V/U packing system, and oversized crankshaft bearings — factory-installed and factory-verified. 1″ hollow SAE J609-1″ shaft for direct Honda GX and compatible engine coupling. Ready to mount.
• VRT3-310A External Bypass Unloader — 4500 PSI Industrial Duty — Factory-plumbed and pressure-set to the 4.3 GPM / 4400 PSI operating duty point of the W4443VRT. The VRT3-310A provides smooth pressure regulation, stable output under varying flow conditions, and controlled bypass from the first startup. No aftermarket tuning required. The VRT external unloader is a significant upgrade over built-in unloader designs — it is fully serviceable in the field, replaceable without disassembling the pump head, and rated to 4500 PSI for a wide safety margin above the pump’s operating pressure.
• Easy Start Feature — At engine startup, the VRT bypass circuit opens and the pump starts against zero back pressure. The engine engages freely under no hydraulic load — recoil pull-starts require minimal effort and electric starters draw minimal current. Once the engine reaches operating speed, the bypass closes and the system builds to 4400 PSI. Easier starts on every pull. Less starter wear. Longer engine life. This is particularly valuable on Honda GX series engines and other recoil-start platforms where hydraulic back pressure at startup accelerates starter rope and pawl wear.
• Exterior Bypass Recirculation Loop — Factory-Plumbed — The bypass recirculation circuit is factory-assembled and connected, providing controlled water flow during trigger-off intervals and protecting the pump from pressure spikes throughout the cleaning cycle. When the trigger gun is closed, water bypasses through the VRT circuit rather than deadheading in the pump head — extending pump life and maintaining stable system pressure.
• Automatic Thermal Relief Valve (TRV) — Factory-Installed in Bypass Circuit — The thermal sensing element continuously monitors bypass water temperature. When bypass water reaches 124–145°F, the TRV opens automatically — hot water exits through the relief port and ambient-temperature supply water flows in to replace it. When temperature returns to the safe operating range, the TRV closes automatically. No manual reset. No operator intervention required. The W4443VRT pump is thermally protected at all times — including during the extended idle intervals unavoidable in daily contractor and fleet washing operations.
• Fittings and Mounting Hardware — Every fitting and fastener required for installation onto contractor skids, trailer frames, fleet wash bays, and OEM gas engine systems. Organized in the box. Nothing to source separately.
• Factory Break-In Oil — Crankcase pre-filled at 0.16 U.S. gal with SynPower Gear Oil 75W-90. Oil sight glass and vented dipstick included for ongoing monitoring. After the break-in period (50–100 hours), replace with standard SAE 75W-90 — and never change it again. Lifetime oil for the life of the pump.
• Operator’s Manual and Service Schematics — Complete installation, startup, operating, and maintenance procedures with part numbers for every serviceable component.

Why the W4443VRT Uses External Bypass — Not Built-In

Unlike built-in unloader designs, the W4443VRT routes bypass flow through the external VRT3-310A. The standard W4443 includes a built-in unloader valve machined into the forged brass head. For many applications, this is ideal — it is compact, factory-calibrated, and requires no additional plumbing. The W4443VRT takes a different approach for contractor and industrial applications where serviceability, pressure precision, and long-term reliability under continuous duty are the priority.

An external bypass unloader like the VRT3-310A is fully accessible without removing the pump head. Pressure adjustment is made at the unloader body — no disassembly required. If the unloader ever needs service or replacement, it is a standalone component that comes off independently without touching the pump. For operations running multiple shifts, fleet washing programs, or skid systems where downtime is measured in lost revenue, an external unloader is the professional-grade choice.

Performance

What’s Inside the W4443VRT Pump

• Forged Brass Manifold — Increased Wall Thickness — Engineered for higher operating temperatures and maximum rigidity under overpressure events.
• LowStressthread™ Valve Caps — Recessed O-ring design. Thread never contacts pressurized water. No Loctite required. Torque reduced by 40%.
• AISI 316 Stainless Steel Valve Assemblies — Mirror-finish, rapid-action check valves for corrosion resistance and maximum fluid dynamic efficiency.
• Dual Redundant V/U Packing System — Fabric-reinforced nitrile buna front seals with Inox-compatible rear seals. Self-energizing under pressure. Long service life under continuous-duty cycling.
• Solid Ceramic Plungers — High-grade ceramic for years of uninterrupted high-pressure performance. Smooth surface finish minimizes seal wear and maximizes volumetric efficiency.
• Bronze Connecting Rods (One-Piece) — Superior anti-friction performance, lower operating temperatures, and extended service life vs aluminum rods.
• Oversized Crankshaft Bearings — Extended service life under heavy and continuous-duty conditions.
• Forged Steel Crankshaft — Extended Length — Maximum structural rigidity for solid pump-to-engine coupling.
• Die-Cast Aluminum Crankcase — Anti-corrosion alloy with diamond-tool machined plunger guide surfaces and enhanced cooling fins.
• VRT3-310A External Bypass Unloader — 4500 PSI — Field-serviceable, independently replaceable, factory-set to 4400 PSI operating pressure.
• Automatic Thermal Relief Valve — Factory-installed in bypass circuit. Activates at 124–145°F. Automatic reset. No operator intervention.

Specifications

Applications

• Contractor pressure washing skids and trailer systems
• Fleet and heavy equipment washing programs
• Honda GX engine direct-drive installations
• OEM gas engine skid builds
• Industrial and commercial washdown systems
• Multi-shift operations requiring continuous-duty reliability

W4443VRT vs Comet ZWD4040G and General Pump EZ4040G — The Italian Standard, Raised

The Comet ZWD4040G and General Pump EZ4040G are the benchmark professional triplex pumps for Honda GX390 direct-drive applications. Both are respected Italian-engineered products. Both deliver 4000 PSI at 4.0 GPM at 3450 RPM. Both sell for $459 to $701 depending on plumbing configuration and source. The W4443VRT is priced at $479 delivered — less than most configurations of either competitor — and delivers 4400 PSI at 4.3 GPM at 3450 RPM. More pressure. More flow. Lower price. And a 7-year warranty that neither Comet nor General Pump matches.

Side by Side

The Fuel Savings Argument — Run Your GX390 Slower and Save Money Every Day

This is where the W4443VRT creates an operational advantage that no spec sheet captures. Honda publishes the GX390 fuel consumption at 0.92 gallons per hour at 3600 RPM under full load. A contractor running a standard 4000 PSI / 4.0 GPM pump must operate the GX390 at 3450–3600 RPM to achieve rated output. That is where the engine runs all day, every day, at near-maximum fuel consumption.

The W4443VRT is rated at 4.3 GPM at 3450 RPM. A contractor who only needs to match the 4.0 GPM output of the Comet or General Pump standard can drop the engine speed to approximately 3000 RPM — and still exceed the competitor’s pressure rating. At 3000 RPM, the GX390’s fuel consumption drops measurably. Honda’s own continuous rated power data shows the engine delivering 8.6 HP at 3000 RPM versus 9.4 HP at 3600 RPM — a meaningful reduction in fuel draw at a speed where the W4443VRT still delivers more than the competition runs at full throttle.

For a contractor running 6–8 hours per day, 5 days per week, the fuel savings compound quickly. At $3.50 per gallon, even a 10–15% reduction in fuel consumption at reduced operating RPM translates to meaningful savings across a season — savings that a Comet or General Pump operator simply cannot access because their pump requires full throttle to reach rated output.

The Noise Argument — Quieter on Every Job Site

Engine noise is a real-world contractor concern — HOA restrictions, residential job sites, early morning start times, and city ordinances all place limits on operating noise levels. The GX390 running at 3000 RPM is measurably quieter than the same engine running at 3450–3600 RPM. Decibel levels do not scale linearly with RPM — a 15% reduction in engine speed produces a disproportionate reduction in perceived noise, particularly at the frequencies where small engine exhaust is most intrusive.

A contractor running the W4443VRT at reduced RPM to match competitor flow rates is operating a quieter machine — on residential jobs where that matters, that is a professional advantage that costs nothing extra.

The Warranty That No Italian Competitor Matches

Comet backs the ZWD4040G with 5 years. General Pump backs the EZ4040G with 5 years on the pump and a lifetime warranty on the forged brass manifold only. Both are good warranties from respected manufacturers. The W4443VRT carries Bertolini’s 7-year warranty — two full years longer than either competitor. For a contractor running this pump daily, two additional years of warranty coverage is not a marketing statistic. It is real financial protection on a piece of equipment that earns revenue every time it runs.

7-Year Warranty

The W4443VRT carries Bertolini’s industry-leading 7-year warranty on the pump, backed by over 100 years of Italian engineering and millions of pumps operating globally. The VRT3-310A unloader and TRV are covered under their respective manufacturer warranties. Contact WSHPWR for warranty support and service guidance.