August 5, 2025

Built to Outlast: UnitedBuilt 4x3 Water Truck Pumps

When uptime, durability, and direct interchangeability matter, UnitedBuilt delivers. Designed for rugged performance and direct OEM interchangeability, our 4x3 pumps offer a smart, value-driven solution backed by American craftsmanship. Proudly manufactured in the USA with domestic and global materials, these pumps combine precision machining, premium materials, and proven reliability to keep your water truck fleet moving.

USA Made in Phoenix, Arizona — Using Domestic and Global Materials

Every UnitedBuilt pump is CNC-machined, painted, assembled, tested, and quality-checked in Phoenix, Arizona, by experienced machinists who understand water truck demands. All major components are CNC-machined in-house using computer-controlled centers to ensure exact sizing, reliable part interchange, and tight dimensional tolerances.

Direct Interchange with Berkeley 4x3 PTO Shaft-Driven Pumps

Our pump is fully compatible with:

Berkeley B68416
Berkeley B68417
Berkeley B66895
Berkeley B66899

Whether you’re using a mechanical seal or rope packing seal, these pumps drop right in as a direct replacement for popular PTO-driven 4x3 configurations—no adapter kits or guesswork required.

The Heart of the Pump: StressProof® Steel Shafts

We only use genuine patented StressProof® steel shafts—not imitations. This specialty steel is produced via cold drawing through a proprietary die, followed by precise stress relieving in a controlled furnace, giving it:

Superior resistance to torsional fatigue
Outstanding durability under load
Proven long-term reliability in high-demand settings

And we don’t stop there:

Shafts are machined in a single work holding to maintain a concentric axis and minimize impeller runout (a leading cause of vibration).
Threads are cut to 3A aircraft-grade tolerances for fit, strength, and reliability.
Every shaft undergoes GO/NO-GO gauge testing, traceable to NIST standards, ensuring certified precision every time.

Premium Castings. Perfected Geometry.

All major pump castings are made from SAE Grade 3000 gray iron, melted from virgin iron ore and alloyed in an induction furnace for strength and integrity. These include:

Pump brackets
Volutes
Impellers
Rear bearing caps

We take it a step further:

Impellers are dynamically balanced in two planes to reduce vibration—extending bearing and shaft life.
Impeller Inlet ports are precision-centered within the casting to ensure optimal impeller concentricity and flow.
Volutes include four ¼-inch NPT drain plugs, allowing for complete winterization no matter how the pump is mounted.

Built with Precision. Backed by Craftsmanship.

All components are CNC-machined for size consistency, part interchangeability, and tight tolerances.
Assembly is performed by skilled machinists, not line workers. Every unit is inspected for fit, function, and finish before it leaves the shop.
In-stock availability and fast shipping means no downtime waiting on overseas lead times or backordered parts.

Pump Features at a Glance

✔️ Direct interchange with Berkeley B-series PTO pumps
✔️ Designed for mechanical seal and rope packing seal options
✔️ Shafts made from certified StressProof® steel
✔️ Single-workholding shaft machining for reduced vibration
✔️ Impellers balanced dynamically in two planes
✔️ High-grade SAE 3000 gray iron castings
✔️ CNC-machined for precision and consistency
✔️ Fully machined, assembled and QC’d in Phoenix, Arizona
✔️ Fast shipping and expert U.S.-based support

Built to Perform. Priced for Value.

At UnitedBuilt, our 4x3 pump is designed to meet the rigorous demands of water truck operations—with tight machining tolerances, dynamic impeller balancing, and precision shaft geometry. The result: reliable performance, reduced vibration, and consistent uptime—delivered with outstanding value and in-stock availability.

Ready to Perform. Ready to Ship.

Looking for a replacement water truck pump that installs easily, performs reliably, and holds up in the real world? UnitedBuilt’s 4x3 centrifugal pumps are in stock and ready to go—made by people who understand what it takes to keep your trucks working.

👉 Shop UnitedBuilt 4x3 Pumps Today

Filed in: Water Pumps

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Water Truck Pumps

Shop all Water Truck Pumps

Built to Outlast: UnitedBuilt 4x3 Water Truck Pumps

USA Made in Phoenix, Arizona — Using Domestic and Global Materials

Direct Interchange with Berkeley 4x3 PTO Shaft-Driven Pumps

The Heart of the Pump: StressProof® Steel Shafts

Premium Castings. Perfected Geometry.

Built with Precision. Backed by Craftsmanship.

Pump Features at a Glance

Built to Perform. Priced for Value.

Ready to Perform. Ready to Ship.

Water Truck Pumps

Water Truck Pump, Cast Iron, 4x3, Counter-Clockwise (CCW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68416MS

Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68417MS

Water Truck Pump, Cast Iron, 4X3, Counter Clockwise (CCW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66895MS

Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66899MS

Water Truck Pump, Clockwise (CW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM B3Z-HD , 1-1/2" Shaft x 3/8" Key, ATP B86070

Water Pump, CW Self Priming, Mechanical Seal, 4x4 FNPT, Hydraulic Drive, B4ZRKS, ATP B69876

Water Pump B3ZRMS, 4" Suction x 3" Discharge FNPT, Clockwise (CW), Mechanical Seal, Hydraulic Drive SAE C 4-Bolt, 1-1/4" x 14T Splined Shaft, Berkeley B69875

Water Truck Pump, Cast Iron, 4x3 Counter-Clockwise (CCW), Mechanical Seal, Groove Volute, Franklin XS439

Water Truck Pump, Cast Iron, 4x3 Clockwise (CW), Mechanical Seal, Groove Volute, Franklin XS439

Water Truck Pump B4ERBMS, 5" Suction x 4" Discharge Flanged, Counter Clockwise (CCW), Mechanical Seal, Berkeley B73027

Featured Water Truck Pumps

Water Truck Pump, Cast Iron, 4x3, Counter-Clockwise (CCW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68416MS

Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68417MS

Water Truck Pump, Cast Iron, 4X3, Counter Clockwise (CCW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66895MS

Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66899MS

Water Truck Pump, Clockwise (CW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM B3Z-HD , 1-1/2" Shaft x 3/8" Key, ATP B86070

Water Pump, CW Self Priming, Mechanical Seal, 4x4 FNPT, Hydraulic Drive, B4ZRKS, ATP B69876

Water Pump B3ZRMS, 4" Suction x 3" Discharge FNPT, Clockwise (CW), Mechanical Seal, Hydraulic Drive SAE C 4-Bolt, 1-1/4" x 14T Splined Shaft, Berkeley B69875

Water Truck Pump, Cast Iron, 4x3 Counter-Clockwise (CCW), Mechanical Seal, Groove Volute, Franklin XS439

Water Truck Pump, Cast Iron, 4x3 Clockwise (CW), Mechanical Seal, Groove Volute, Franklin XS439

Water Truck Pump B4ERBMS, 5" Suction x 4" Discharge Flanged, Counter Clockwise (CCW), Mechanical Seal, Berkeley B73027

Water Truck Pump, Model B4JRMBH, 5" Suction x 4" Discharge Flanged, Counter-Clockwise (CCW), 13.5" Impeller, Rope Packing Seal, Berkeley B62323

Water Truck Pump, Model B4JRMBH, 5" Suction x 4" Discharge Flanged, Clockwise (CW), 13.5" Impeller, Rope Packing Seal, Berkeley B62321

Water Truck Pump B3ZRM, 4" Suction x 3" Discharge FNPT, 9" Impeller, Clockwise (CW), Rope Packing Seal, Hydraulic Motor Direct Coupling Drive, Berkeley B80357

Water Truck Pump, Counter-Clockwise (CCW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM B3Z-HD, 1-1/2" Shaft x 3/8" Key, ATP B85874

Water Truck Pump, CW Self Priming, Mechanical Seal, 4x4 FNPT, Hydraulic Drive, B4ZRKS, Berkeley B69876

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