W4443PIT — Bertolini VRT Package with Chemical Injector | 4400 PSI | 4.3 GPM | Tank Feed

The W4443PIT — the tank feed variant — fully plumbed, chemical-ready industrial 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 W4443PIT — 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 W4443PIT 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.

What’s in the Box

• Tank Feed Inlet King Hose Barb — 1/2″ M NPT x 1-1/4″ Plated Steel Hose Barb — Factory-installed on the pump inlet port. Designed specifically for gravity feed and tank feed systems. Simply connect a 1-1/4″ non-collapsible inlet water hose directly to the barb — no adapter required. The barbed design prevents hose slippage and fluid leaks under suction load. The hex base allows standard wrenches for installation and is large enough to accommodate accessory ports. Compact tapered bore for smooth, unrestricted water delivery from tank to pump.
  • Connection: 1/2″ M NPT x 1-1/4″ plated steel hose barb
  • Hose size: 1-1/4″ non-collapsible inlet hose recommended
  • Application: Gravity feed and tank feed systems
  • No adapter needed — assembles directly to pump inlet
• 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 W4443PIT. 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 W4443PIT 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 — The W4443PIT includes 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 W4443PIT Uses External Bypass — Not Built-In

Unlike built-in unloader designs, the W4443PIT 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 W4443PIT 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.

W4443PIT Performance

What’s Inside the W4443PIT 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

Tank Feed and Gravity Feed Systems

The “T” suffix on the W4443PIT designates the Tank Feed configuration. Where standard pump installations draw water directly from a pressurized supply line, tank feed and gravity feed systems supply water from an elevated reservoir, IBC tote, buffer tank, or open container — relying on gravity head pressure or a low-pressure transfer pump rather than municipal supply pressure. This is common on trailer-mounted contractor rigs, skid systems with buffer tanks, agricultural washdown setups, and remote job sites where pressurized water supply is unavailable.

The Tank Feed Inlet King Hose Barb installed on this pump eliminates the adapter stack that would otherwise be required to connect a large-bore suction hose to the pump’s standard 1/2″ female thread inlet. The 1/2″ M NPT x 1-1/4″ plated steel hose barb accepts a 1-1/4″ non-collapsible suction hose directly — the barb profile locks the hose in place under suction without clamp slippage, and the hex base provides a wrench flat for a leak-free torqued connection. The result is a clean, low-restriction inlet path from tank to pump with no improvised fittings in the flow path.

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

7-Year Warranty

The W4443PIT 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.