W4443DLX — Bertolini Deluxe VRT Package | 4400 PSI | 4.3 GPM | Clear View Filter | 1″ Hollow Shaft

The W4443DLX is the top-of-line deluxe build of WSHPWR’s Bertolini VRT pump package 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 W4443DLX — 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 W4443DLX arrives, it is ready to bolt onto your engine, connect your water supply, drop the detergent hose into your soap bucket, and operate at 4400 PSI with chemical injection from the first startup — with the added confidence of a heavy-duty clear view inlet filter protecting every drop of water entering the pump.

What’s in the Box

• Clear View Dual-Port Brass Inlet Water Filter — Upgraded — The defining upgrade of the W4443DLX. This is not a standard inline filter. Machined from heavy-duty brass — no rust, no corrosion, thick-wall construction that holds up against side torque and rough handling. Features a stainless steel micron inner filter screen inside a transparent body that lets you inspect water clarity and filter condition at a glance without removing a single fitting. Dual 1/4″ side ports accommodate a return bypass hose for full recirculation circuit integration. Rated to 8 GPM and 180°F — the strongest see-through inlet filter available for this class of pump. Rinse, reassemble, and reinstall in under a minute. No tools required.
• 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 W4443DLX. 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 W4443DLX 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.
• Fixed 16% Chemical Injector — Factory-Installed — Downstream chemical injector pre-set to a fixed 16% soap-to-water ratio. Draws detergent automatically whenever the trigger is pulled through the low-pressure circuit. No adjustment required. Compatible with standard pressure washer soaps, degreasers, and detergents.
• DETHOSE-FIL6 — 6 ft Detergent Hose with Red Weighted Debris Filter — Six feet of chemical-resistant thermoplastic hose with an integrated red weighted filter that sinks to the bottom of the detergent container for consistent chemical pickup even as the tank empties. Captures debris and sediment before it reaches the injector, protecting valves and seals from abrasive particles.

Why the W4443DLX Uses External Bypass — Not Built-In

Unlike built-in unloader designs, the W4443DLX 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 W4443DLX 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 W4443DLX 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

W4443DLX vs W4443PI — What’s the Difference

The W4443DLX includes everything in the W4443PI — the VRT3-310A external bypass unloader, Easy Start feature, automatic thermal relief valve, bypass recirculation loop, fixed 16% chemical injector, and DETHOSE-FIL6 detergent hose — plus the clear view dual-port brass inlet filter. For operators running contractor skids, trailer systems, or fleet wash bays where water quality varies and filter condition directly impacts pump life, the ability to inspect the inlet filter at a glance without shutting down the system is a meaningful operational advantage. On the W4443DLX, you see the problem before it becomes one.

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

W4443DLX — When You Want Everything and Then One More Thing

The W4443DLX is the most completely equipped pump package WSHPWR offers. It includes every component in the W4443PI — VRT3-310A external bypass unloader factory-set, automatic thermal relief valve, fixed 16% chemical injector, DETHOSE-FIL6 detergent hose, bypass recirculation loop, Easy Start — plus the clear view dual-port brass inlet filter that no other pump package in this category includes. At $549 delivered, it costs less than assembling an equivalent system from components starting with a bare Comet or General Pump.

W4443DLX vs Build-Your-Own Equivalent

The Clear View Filter — The Detail That Separates Professionals

Every component in the W4443DLX serves a function. The clear view dual-port brass inlet filter is the one that separates contractors who prevent pump failures from contractors who react to them. Inlet contamination — debris, sediment, mineral scale — is the leading cause of premature packing wear and check valve failure in field pump installations. Standard inline filters require removal and disassembly to inspect. The clear view filter on the W4443DLX is inspected at a glance, without stopping work, without touching a fitting. When the filter body shows discoloration or visible debris, you clean it. Before it reaches the pump. At $549 delivered — below the cost of building an equivalent system from components — the W4443DLX is the professional’s choice when downtime is not an option.

7-Year Warranty

The W4443DLX 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.