W4443WST 4400 PSI Tank Feed Pump GX390 Socket QC

W4443WST | Bertolini 4400 PSI 4.3 GPM Tank Feed Pump with Built-In Unloader and Socket Quick Connect

W4443WST is the Bertolini WMG-W pump built for tank and gravity feed, rated 4.3 GPM at 4,400 PSI at 3450 RPM. It has the unloader and an adjustable chemical injector built into the pump head, the King full-flow inlet adapter installed and a quick connect socket on the outlet, so it goes straight onto a trailer or skid fed from a water tank.

Why 4,400 PSI, and why only here: Bertolini’s standard WMG is rated 4,000 PSI. The W4443WST 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 the King Adapter and Built-In Unloader

A tank-fed pump has no supply pressure behind it, so every restriction in the inlet steals flow and risks cavitation. The W4443WST King adapter is a 1/2 in. male NPT by 1-1/4 in. plated steel hose barb with a smooth tapered bore: connect a 1-1/4 in. non-collapsible hose and the pump draws freely, with no adapters in the line. The unloader and adjustable injector are machined into the forged brass head, so there is no bypass hose to route back to the tank.

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: 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 (WST is this page): 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

• W4443WST pump with built-in unloader and adjustable chemical injector, fully assembled
• King tank-feed inlet adapter, 1/2 in. M NPT by 1-1/4 in. hose barb, installed
• Quick connect socket on the outlet, installed
• 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 W4443WST 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

• What hose should I use on the inlet? A 1-1/4 in. non-collapsible hose. A soft hose can collapse under suction and starve the pump.
• What hose connects to the outlet? Any hose with a standard quick connect plug snaps into the W4443WST socket outlet.
• Can it run hot water? The W4443WST is rated to 140°F. For hot water from a tank, see the WHT version.

W4443WST Specifications

• Model: W4443WST (Bertolini WMG-W series)
• Flow: 4.3 GPM at 3450 RPM
• Max Pressure: 4,400 PSI (WSHPWR exclusive rating)
• Unloader: Built in, adjustable
• Injector: Built in, adjustable
• Inlet: King tank-feed adapter, 1-1/4 in. hose barb
• Outlet: Quick connect socket
• 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: 22 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.