W4443VRT 4400 PSI Pump GX390 VRT Unloader Kit

W4443VRT | Bertolini 4400 PSI 4.3 GPM Pump with VRT3-310A External Unloader, GX390

W4443VRT is the W4443 pump plumbed with an external VRT3-310A unloader, rated 4.3 GPM at 4,400 PSI at 3450 RPM. WSHPWR bench tests every unit and pre-sets the unloader to the pump’s duty point, so it arrives as a complete pressure system: bolt it to a GX390-class engine, connect your hose and run.

Why 4,400 PSI, and why only here: Bertolini’s standard WMG is rated 4,000 PSI. The W4443VRT is built with stronger side bearings and upgraded bronze connecting rods, and Bertolini has granted it a 4,400 PSI rating exclusive to WSHPWR.com. It is made in Reggio Emilia, Italy, where Bertolini has built pumps since 1918.

Why an External VRT Unloader

On the W4443VRT, the VRT3-310A is rated to 4,500 PSI, a safety margin above the pump’s 4,400 PSI, and it is fully serviceable in the field: replace it without opening the pump head. Its Easy Start feature opens the bypass at startup, so the engine pulls over against zero back pressure. Recoil starts take less effort and electric starters draw less current. The factory bypass loop and thermal relief valve keep the W4443VRT cool when the trigger is closed: the valve opens at 124 to 145°F, dumps hot water and draws in cool supply water, then closes on its own.

Which W4443 Do You Need?

Every cold water version is rated 4,400 PSI. Choose the one built for your machine:

• Bare pump: no unloader. For shops that reuse their own unloader and plumbing.
• W, WS and WP versions: built-in unloader and injector, with standard, quick connect socket or quick connect plug outlet.
• VRT, VP and VPI versions (VRT is this page): plumbed with an external VRT unloader, a quick connect plug outlet on the VP and VPI, and an injector on the VPI.
• DLX and VPDLX versions: deluxe builds with a double-loop external bypass and a clear view inlet filter.
• T, WT, WST, WPT, VRTT and PIT versions: tank and gravity feed versions with the King full-flow inlet adapter.
• H, WH, HT and WHT versions: hot water versions with 167°F seals, rated 4,060 PSI.

What’s in the Box

• W4443VRT pump, WSHPWR bench tested
• VRT3-310A external unloader, factory plumbed and pressure set
• Bypass recirculation loop and automatic thermal relief valve, factory installed
• All fittings for installation
• SAE J609 1 in. flange mounting bolts and lock washers
• Crankcase filled with Bertolini’s SynPower 75W-90 break-in oil
• Vented dipstick. Install it before the first start. Never run the pump without it.
• 7-year Bertolini warranty

Will It Fit My Machine?

It is a direct replacement for the pump on:

• Simpson SuperPro Roll-Cage SRC4440112
• BE Power Equipment B4415PCS
• Pressure-Pro E4040HA, E4042HV and SLPVV4G42-400
• Machines running Annovi Reverberi RKV4G36, RKV4G40 or RRV4G40 pumps

It fits any direct-drive pressure washer with a 1 in. horizontal engine shaft and SAE J609 mounting face, on a 389cc to 420cc engine (GX390 class).

Not sure the W4443VRT fits? Text a pump specialist at (505) 226-6061 with a photo of your machine’s tag and we’ll confirm.

What Makes a Bertolini Different

• LowStressthread valve caps: the O-ring seals ahead of the thread, so pressure water never reaches it. The caps don’t loosen, need 40% less torque and put 60% less stress on the head.
• Lifetime oil: change the break-in oil once at 50 to 100 hours to standard 75W-90 gear oil, and that fill lasts the life of the pump.
• Built heavy: thick forged brass head, AISI 316 stainless check valves, solid ceramic plungers on nitrided stainless plunger rods, one-piece bronze connecting rods, oversized bearings and an extended forged steel crankshaft.

Common Questions

• Do I need a separate unloader? No. The W4443VRT ships with the VRT3-310A plumbed and set.
• What outlet does it have? A standard outlet. For a quick connect plug outlet, see the VP version.
• Can it run hot water? The W4443VRT is rated to 140°F. For hotter water, choose an H version.

W4443VRT Specifications

• Model: W4443VRT (Bertolini WMG series)
• Flow: 4.3 GPM at 3450 RPM
• Max Pressure: 4,400 PSI (WSHPWR exclusive rating)
• Unloader: VRT3-310A external, rated 4,500 PSI
• Thermal Relief: Opens at 124 to 145°F
• Start Assist: Easy Start
• Shaft: 1 in. hollow
• Mount: SAE J609 1 in.
• Engine: 389cc to 420cc, GX390 class
• Plungers: Solid ceramic, 15 mm
• Connecting Rods: Bronze, one-piece
• Check Valves: AISI 316 stainless steel
• Oil: 0.6 L SAE 75W-90
• Max Water Temperature: 140°F
• Weight: 20 lbs
• Warranty: 7 years
• Brand: Bertolini, made in Italy

Shipping: Ships the same day when ordered by 3 PM EST on business days. Need it faster? Text (505) 226-6061 for expedited air freight options.