4400 PSI Pump Package

3PG4435S — Bertolini Ready-to-Run Pump Package | 4400 PSI | 3.7 GPM | 1″ Hollow Shaft

The 4400 PSI Pump Package 3PG4435S is the socket-ready, bench-tested version of the Bertolini 3PG 4035-W — a professional-grade triplex piston pump engineered by Idromeccanica Bertolini S.p.A. in Reggio Emilia, Italy, and configured by WSHPWR.com for immediate deployment. While the 3PG4435S shares the same forged brass head, Super-U packing seals, bronze connecting rods, and 4400 PSI-rated internals as the standard 3PG4435W, it arrives pre-fitted with a curated set of professional accessories — installed, tested, and ready for work the moment it leaves the box. No sourcing parts. No assembly. No guesswork.

What’s in the Box

Every 4400 PSI Pump Package 3PG4435S is bench tested at WSHPWR before shipment — 90 seconds at idle, followed by 90 seconds at full rated pressure — to verify pump integrity, plumbing seal quality, and workmanship. Each unit ships with the following installed and included:

• Fully Assembled Bertolini 3PG 4035-W Pump — Complete with built-in unloader valve, fixed 16% detergent injector, and brass barb. The same 4400 PSI-rated pump exclusively available through WSHPWR.com for North America, Central America, and the Caribbean.
• SAE J609-1″ Flange with 4-Bolt and Washer Kit — Pre-attached mounting flange for seamless installation directly to your engine. Hardware included — nothing to source separately.
• Vented Dipstick — Manually installed prior to bench testing and shipping. Do not remove before field use. This vented cap is critical for preventing crankcase vapor buildup and protecting the seals during operation.
• AL-QC3/8B — 3/8″ F x 3/8″ F Brass Quick-Connect Coupler (Outlet) — Installed on the pump outlet port. Precision-machined solid brass construction. Tool-free connect and disconnect for fast hose gun changes. Smooth internal bore maintains full system pressure to the nozzle with no flow restriction.
• 5332 — Garden Hose Adapter, 3/4 GH x 3/8″ Male (Inlet) — Installed on the pump inlet port. Converts a standard 3/4″ garden hose connection to the pump’s 3/8″ female thread inlet — no additional fittings required. Connect your water supply and go.
• TPP140-1/4 — Brass Thermal Relief Valve, 1/4″ (Upgraded Version) — Installed on the low-pressure manifold head port. Automatically activates at 140°F when the trigger gun is held closed during extended bypass operation, discharging overheated water and drawing in cooler supply. Protects the pump seals, plunger surfaces, and valve seats from heat damage during idle periods. The 3PG4435S uses the upgraded brass body version of the TPP140 for superior corrosion resistance and longer service life compared to standard aluminum versions.
• DETHOSE-FIL6 — 6 ft Detergent Hose with Red Weighted Debris Filter — Included in the box for detergent feed setup. Six feet of chemical-resistant thermoplastic hose with an integrated red weighted filter that sinks to the bottom of the detergent container, ensuring consistent chemical pickup even as the tank empties. The red filter captures debris and sediment before it reaches the injector, protecting seals and valves from abrasive particles.

Bench Tested Before It Ships

Every 4400 PSI Pump Package 3PG4435S undergoes a documented bench test at WSHPWR prior to packaging. The test sequence runs 90 seconds at idle power followed by 90 seconds at full rated pressure. This confirms pump performance integrity, verifies that all plumbing connections are leak-free, and validates workmanship quality before the unit is packed for shipment. This is not a factory test — it is performed on your specific pump, with your specific hardware installed, after assembly. When you open the box, the 3PG4435S has already run.

The Forged Brass Head — Why It Matters

The most critical component in any high-pressure piston pump is the head — and this is exactly where the 3PG4435S separates itself from lower-cost alternatives. Bertolini starts with a solid billet of high-grade brass and subjects it to a precision hot-forging process under enormous mechanical force. Forging — as opposed to casting — aligns the grain structure of the metal, producing a head with significantly higher tensile strength, better fatigue resistance, and zero porosity. A cast head has microscopic voids and inconsistencies introduced during the cooling process. A forged head does not.

Once forged, each 4400 PSI Pump Package 3PG4435S head is machined in Bertolini’s Reggio Emilia facility using fully automated, custom-engineered CNC tooling. Equipment is manufactured in state-of-the-art facilities with CNC machining, robotics, and high levels of automation, with inspection, testing, and verification at every stage of production. Every port, every valve seat, every thread is cut to exact tolerances — not ground down after the fact to compensate for inconsistencies. The result is a head that seals perfectly, withstands extreme cyclical pressure loads, and does not require Loctite on the valve caps.

Performance at Every Speed

The 4400 PSI Pump Package 3PG4435S delivers consistent 4400 PSI across all three operating speeds. Match the RPM to your engine for optimal GPM output.

What’s Inside the 3PG4435S

• Forged Brass Head — 8-bolt crankcase attachment, maximum rigidity under extreme pressure and overpressure events.
• LowStressthread™ Valve Caps — Recessed O-ring design. Thread never contacts pressurized water. No Loctite required. Torque reduced by 40%.
• AISI 316 Stainless Check Valves — Mirror-finish, rapid-action valves for corrosion resistance and maximum fluid efficiency.
• Super-U Packing Seals — Double-U self-lubricating composite seals prevent crankcase oil contamination.
• Tungsten Carbide-Coated Plunger Rods — Maximum wear resistance and volumetric efficiency.
• Bronze Connecting Rods (One-Piece) — Integral bronze alloy construction for superior anti-friction performance and long service life.
• Oversized Premium Bearings — Extended service life under heavy and continuous-duty conditions.
• Die-Cast Aluminum Crankcase — Anti-corrosion alloy with diamond-tool machined plunger guide surfaces and enhanced cooling fins.
• Anti-LeakSystem™ — Head-to-crankcase dust exclusion system extends packing seal life in outdoor and dusty environments.

Specifications

Applications

• Professional pressure washing and contract surface cleaning
• Fleet and heavy equipment washing
• Self-service car wash bay systems
• Pre-painting and surface preparation
• Tank and vessel cleaning
• Industrial process and manufacturing washdown
• Mobile wash rigs requiring a ready-to-run pump package

The Warranty That Sets the 3PG4435S Apart — 7 Years vs the Industry Standard 5

Every serious Italian pump manufacturer backs their professional triplex pumps with a warranty. Comet backs theirs with 5 years. General Pump backs theirs with 5 years on the pump and a lifetime warranty on the forged brass manifold only. These are good warranties from respected manufacturers. The 3PG4435S carries Bertolini’s 7-year warranty — two full years longer than the industry standard from any Italian manufacturer in this class.

Two years of additional warranty coverage is not a minor difference on a pump that runs daily in contractor operations. It is the difference between a pump that is covered through its third season and one that is covered through its fifth. For a contractor running this pump on a trailer rig or fleet washing system, that coverage window aligns with the realistic service life expectation of a pump in continuous professional use. Bertolini offers it because the construction supports it — the forged brass head, bronze connecting rods, solid ceramic plungers, and LowStressthread™ valve cap system are not components that fail at year six.

How the 3PG4435S Compares to Professional Italian Pump Standards

The 4000 PSI Advantage on a Honda GX390

The Honda GX390 is the most proven 13HP engine in the pressure washing industry — the contractor’s choice for decades on trailer rigs, fleet washing systems, rental fleets, and mobile detailing units worldwide. The established market standard pairs the GX390 with a 4000 PSI triplex pump. The 3PG4435S pairs with the same engine, the same 1″ hollow shaft, the same SAE J609-1″ flange — and delivers 4400 PSI. That is 400 PSI more from the same engine you already own and trust.

The trade is 0.3 GPM — 4.0 down to 3.7. For contractors whose work is pressure-dependent — removing stubborn surface contaminants, restoring concrete, fleet washing commercial vehicles, paint and stain prep — the 4400 PSI Pump Package 3PG4435S at 4400 PSI delivers results the standard 4000 PSI configuration cannot match at any flow rate. At 3450 RPM the 3PG4435S draws 10.4 HP — well within the GX390’s 13HP output — leaving a comfortable margin that protects the engine and extends its service life under continuous operation.

Your GX390 Was Made for More Than 4000 PSI

The GX390 has been pairing with 4000 PSI pumps for decades not because 4000 PSI is its limit — but because 4000 PSI / 4.0 GPM became the market’s default configuration. The engine has the output to support more. The 3PG4435S is the pump that uses it. Same mount. Same shaft. Same engine. Four hundred more PSI, two more years of warranty, and a pump built in Reggio Emilia, Italy since 1918 — bench tested at full pressure before it ships to your door.

The 3PG4435S is exclusively available through WSHPWR.com for North America, Central America, and the Caribbean. It ships the same day or next day, free to all 48 states.

7-Year Warranty

The 4400 PSI Pump Package 3PG4435S carries Bertolini’s industry-leading 7-year warranty on the pump, backed by over 100 years of Italian engineering. WSHPWR.com-installed accessories are verified through the bench test process. When you run the 3PG4435S for the first time in the field, it has already proven itself.