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Flojet R3B21502A Road Roller Series 3 Chamber Diaphragm Pump - 50 PSI, 1.25 GPM, 12 VDC, 1/2 Inch Hose Barb Ports

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4.40 lbs
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This is a road roller series diaphragm pump used for road construction vehicles such as steamrollers. For applications that involve spraying a continuous application of water to road rollers. Produces flow rates of 1.25 GPM.
Prep 65

Prop 65


Technical Specifications

Max PSI: 50
Max GPM: 1.25
Voltage DC: 12
Outlet Port: 1/2 inch
Inlet Port: 1/2 inch

Product Description

Motor Operated Pump

Flojet's R3B21502A is a three-chamber diaphragm pump designed for road rollers and includes an integrated 12 VDC electric permanent magnet motor. Engineered with an external bypass system to protect the pump from excessive back pressure. Features the ability to run and self-prime when dry without damaging the critical components of the pump. Operates at a maximum pressure of 50 PSI.


  • Pump Design: Motor Operated 3 Chamber Diaphragm
  • Motor: Permanent Magnet DC
  • Voltage: 12V DC
  • Pump Head: Glass Filled Nylon
  • Amp Draw: 8.5
  • Max Running Pressure: 50 PSI
  • Bypass PSI: 50
  • Diaphragm: Santoprene
  • Check Valve: Viton 
  • Max. Flow Rate @ 30 PSI: 1.25 GPM
  • Fittings: 1/2" HB ST
  • Max. Liquid Temperature: 4 - Min, 71 - Max °C, 40 - Min, 160 - Max °F
  • Duty Cycle: Continuous
  • Weight: 7.0lb
  • Size: L 9.53" x W 4.45" x H 4.24"
  • Certifications: CE, RoHS, C-Tick, E-Mark
  • Port Size Inlet / Outlet: Standard 1/2" HB Straight


  • Highest flow rates for their size
  • Plug-in ports for easy installation and servicing
  • Can be mounted easily anywhere with functional mounting platforms & simple connections - fit it
  • anywhere and plumb up
  • External bypass protects the pump from back pressure
  • Low cost, low maintenance modular design means a trouble-free service life
  • Spare parts & accessories are readily available & easy to install
  • Self-priming even when dry
  • Dry vertical lift from 6 ft. up to 10 ft.
  • Can run dry without damage


  • Ride-on Road Rollers with knock-down bar
  • Ride-on Road Rollers with articulating-swivel
  • Vibratory Road Rollers
  • Pneumatic-tyre Road Rollers
  • Tractor mounted and powered Road Rollers

WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm (For more information go to

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