WATERAX B2X™ MID-RANGE SERIES
High-volume 2-stage pumps delivering up to 310 GPM and 200 PSI. The ideal balance of pressure and flow for wildland-urban interface firefighting, brush trucks, and water transfer operations.
Best-in-Class Mid-Range Performance
The WATERAX B2X™ series delivers the optimal combination of pressure and volume for wildland-urban interface operations. These versatile 2-stage centrifugal pumps produce flows up to 310 GPM and pressures up to 200 PSI, making them ideal for dual attack lines, booster reels, water transfer, and structure protection.
Designed for OEM fire apparatus manufacturers, the B2X uses a proven low-maintenance belt drive system that provides efficient and dependable performance. The quick-release clamp allows pump end changes in minutes without disassembling the complete unit.
Available with 18-23 HP Briggs & Stratton Vanguard, 21 HP Honda GX630, or 25 HP Kubota diesel engines. The larger 3" intake and 2-1/2" discharge connections handle high-volume water transfer with minimal friction loss.
Key Features
High Volume Output
Up to 310 GPM free flow with 3" NPT/4" Victaulic intake and 2-1/2" NPT/3" Victaulic discharge. Run dual 1-1/2" attack lines or a 2-1/2" supply line simultaneously.
Quick-Release Pump End
Hand-tight clamp allows the entire pump assembly to separate from the engine/speed increaser without tools. Swap pump ends in minutes for field service or performance changes.
Low-Maintenance Drive
Timing belt and pulley system with 1.88:1 speed increaser provides efficient, reliable power transfer. Sealed ball bearings eliminate pump end greasing in the field.
Choose Your B2X Configuration
The B2X series offers multiple engine options: Briggs & Stratton Vanguard (18 or 23 HP), Honda GX630 (21 HP), or Kubota diesel (25 HP). All models share the same 2-stage pump end with 3" intake and 2-1/2" discharge.
B2X-18 (18 HP Briggs & Stratton)
B2X-18 Performance
Maximum Pressure: 190 PSI (13.1 BAR)
Maximum Flow: 300 GPM (1136 L/min)
Maximum Head: 439 ft (134 m)
Pump Type: 2-stage centrifugal
B2X-18 Flow at Pressure
At 50 PSI: 261 GPM (988 L/min)
At 100 PSI: 150 GPM (568 L/min)
At 150 PSI: 65 GPM (246 L/min)
B2X-18 Configurations
B2X-18V: Vehicle mount, vertical drive
B2X-18VT: With integral fuel tank
B2X-18VX: With exhaust primer
B2X-18PTC: Portable with carry frame
Weight: 153-161 lbs
B2X-23 (23 HP Briggs & Stratton)
B2X-23 Performance
Maximum Pressure: 200 PSI (13.8 BAR)
Maximum Flow: 300 GPM (1136 L/min)
Maximum Head: 462 ft (141 m)
Pump Type: 2-stage centrifuga
B2X-23 Flow at Pressure
At 50 PSI: 288 GPM (1090 L/min)
At 100 PSI: 200 GPM (757 L/min)
At 150 PSI: 95 GPM (360 L/min)
B2X-23 Configurations
B2X-23V: Vehicle mount, vertical drive
B2X-23P: Portable base
B2X-23PC: Portable with control panel
B2X-23PXTC: Portable with exhaust primer
Weight: 167-195 lbs
B2X-21H (21 HP Honda GX630)
B2X-21H Flow at Pressure
At 50 PSI: 275 GPM (1041 L/min)
At 100 PSI: 215 GPM (814 L/min)
At 150 PSI: 112 GPM (424 L/min)
B2X-21H Configuration
B2X-21H: Vehicle mount, horizontal drive
Engine: Honda GX630 twin-cylinder
Power: 20.8 HP @ 3600 RPM
Weight: 169 lbs
B2X-21H Performance
Maximum Pressure: 200 PSI (13.8 BAR)
Maximum Flow: 300 GPM (1136 L/min)
Maximum Head: 462 ft (141 m)
Pump Type: 2-stage centrifugal
B2X-D902 (25 HP Kubota Diesel)
B2X-D902 Performance
Maximum Pressure: 180 PSI (12.4 BAR)
Maximum Flow: 310 GPM (1173 L/min)
Pump Type: 2-stage centrifugal
Max Allowable: 400 PSI (27.6 BAR)
B2X-D902 Flow at Pressure
At 50 PSI: 274 GPM (1037 L/min)
At 75 PSI: 250 GPM (946 L/min)
At 100 PSI: 220 GPM (833 L/min)
At 150 PSI: 110 GPM (416 L/min)
B2X-D902 Configurations
B2X-D902V: Vehicle mount, vertical drive
B2X-D902H: Vehicle mount, horizontal drive
Engine: Kubota D902-E4B 3-cylinder liquid cooled
FastWire: 14-pin connector standard
Common Pump Specifications
All B2X models share these pump end specifications.
Pump End Specifications
Pump Construction
Type: Detachable 2-stage centrifugal
Body & Diffusers: Anodized corrosion-resistant aluminum
Impellers: 4.00" diameter, anodized aluminum
Pump Shaft: Stainless steel
Max Allowable Pressure: 400 PSI (27.6 BAR)
Pump Connections
Intake: 3" NPT Female / 4" Victaulic Combination
Discharge: 2-1/2" NPT Female / 3" Victaulic Combination
Clamp: Hand-tight quick-release (no tools needed)
Drive: Timing belt & pulley, 1.88:1 ratio
Seals & Bearings
Bearings: Maintenance-free sealed ball bearing & sintered bronze sleeve
Pump Seal: Blister-resistant carbon seal face, silicon carbide seat
Ratings: ISO 9 and NFPA 1906 Medium Pressure
Special: Pump separates completely from engine
Applications
The B2X mid-range pump combines pressure and volume for the most versatile firefighting capability.
Brush Trucks & Slip-Ons
Designed for OEM fire apparatus manufacturers. Vehicle-mount configurations with FastWire connectivity integrate seamlessly with WATERAX control panels for professional brush truck builds.
High-Volume Water Transfer
The 3" intake and 310 GPM flow capacity make the B2X excellent for rapid tank filling, tanker operations, and portable tank supply during extended firefighting operations.
Structure Protection
Supply 2-1/2" lines for structure firefighting or run booster reels for initial attack. The B2X delivers enough pressure and volume for serious structure protection work.
Wildland-Urban Interface
The ideal pump for WUI operations where both reach and volume are critical. Run dual 1-1/2" attack lines simultaneously for structure protection while maintaining pressure for wildland attack.
Documents & Resources
B2X-23P Data Sheet
Official WATERAX B2X-23 portable specifications and performance curves.
B2X-21H Data Sheet
Official WATERAX B2X-21H Honda specifications and technical drawings.
Owner's Manual
Complete operating instructions, maintenance procedures, and safety guidelines for all B2X models.
B2X-18V Data Sheet
Official WATERAX B2X-18V specifications, performance curves, and technical drawings.
Shop Parts
Genuine WATERAX replacement parts ensure your pump delivers reliable performance season after season. From pump bodies and impellers to suction covers, mechanical seals, and shaft assemblies—we stock the components you need to maintain and service your pump.