ARO four-ball pneumatic piston pumps are available in a wide range of ratios, displacements, and materials of construction to meet your application needs. For additional help with selecting the pump that best fits your application, please contact our technical support staff at 1-888-339-2060.

Piston Pumps Brochure

ARO, Four-Ball, Pneumatic Piston PumpsARO 650439-X4B Four-Ball Pneumatic Piston Pumps

  • 2:1 Ratio, 4 1/4" Air Motor
    21.3 GPM (80.6 LPM) max flow
    60 – 312 psi (4.1 – 21.5 bar) fluid pressure

  • Reliability- Multiple packing options permit maximum fluid compatibility
    Durability- Ultra Coated (ceramic) Plunger Rod and Tube for superior abrasion resistance
    Versatility- High flow rate excellent for large transfer or fluid recirculation
    Environmentally Sound- Optional muffler ensures pump meets OSHA specifications
    Serviceability- Modular design for ease of repair

650439-X4B Pump Specifications | 650439-X4B Operators Manual

ARO, Four-Ball, Pneumatic Piston PumpsARO 650640-X4B Four-Ball Pneumatic Piston Pumps

  • 3:1 Ratio, 6" Air Motor
    29.3 GPM (110.8 LPM) max flow
    90 – 457 psi (6.2 – 31.5 bar) fluid pressure

  • Reliability - Multiple packing options permit maximum fluid compatibility
    Durability - Ultra Coated (ceramic) Plunger Rod and Tube for superior abrasion resistance
    Versatility - High flow rate excellent for large transfer or fluid recirculation
    Environmentally Sound - Optional muffler ensures pump meets OSHA specifications
    Serviceability - Modular design for ease of repair

650640-X4B Pump Specifcations | 650640-X4B Operators Manual

ARO, Four-Ball, Pneumatic Piston PumpsARO 650639-X4B Four-Ball Pneumatic Piston Pumps

  • 2:1 Ratio, 2" Air Motor
    2.15 GPM (8.14 LPM) max flow
    0 - 351 psi (0 - 24.2 bar) fluid pressure

  • Available in Stainless Steel and Carbon Steel Construction
    Reliability - Proven air motor design ensures stall-free, ice-free pump operation
    Durability - Hard chrome plated plunger improves abrasion resistance
    Versatility - Available in a wide range of materials to meet your application needs
    Environmentally Sound - Standard muffler ensures pump meets OSHA specifications
    Serviceability - Minimal fluid section part count for simple, efficient repairs

650639-X4B Operators Manual | 650639-X4B Pump Specifications

ARO, Four-Ball, Pneumatic Piston PumpsARO 650840-X4G-B Four-Ball Pneumatic Piston Pumps

  • 5:1 Ratio, 8" Air Motor
    32.8 GPM (124.0 LPM) max flow
    150 – 702 psi (10.3 – 48.4 bar) fluid pressure

  • Reliability- Multiple packing options permit maximum fluid compatibility
    Durability- Ultra Coated (ceramic) Plunger Rod and Tube for superior abrasion resistance
    Versatility- High flow rate excellent for large transfer or fluid recirculation
    Environmentally Sound- Optional muffler ensures pump meets OSHA specifications
    Serviceability- Modular design for ease of repair

650840-X4G-B Operators Manual | 650840-X4G-B Pump Specifications

ARO, Four-Ball, Pneumatic Piston PumpsARO 650839-X4G-B Four-Ball Pneumatic Piston Pumps

  • 7:1 Ratio, 8" Air Motor
    23.5 GPM (88.8 LPM max flow
    210 – 1,009 psi (14.5 – 69.6 bar) fluid pressure

  • Reliability- Multiple packing options permit maximum fluid compatibility
    Durability- Ultra Coated (ceramic) Plunger Rod and Tube for superior abrasion resistance
    Versatility- High flow rate excellent for large transfer or fluid recirculation
    Environmentally Sound- High flow rate excellent for large transfer or fluid recirculation
    Serviceability- Modular design for ease of repair

650839-X4G-B Operators Manual | 650839-X4G-B Pump Specifications