HDF1 and HDF25 Metallic 1" (25 mm) AODD – Flap Valve Pump


    The flexible, portable and lightweight design of the SANDPIPER HDF1 heavy-duty flap valve pump offers maximum convenience when faced with the most common challenges in sump applications, mine dewatering and any liquid application involving solids.

    The HDF1 has a superior flow rate to all other 1" AODD pumps and is a proven and trusted solution even in the harshest applications, effortlessly moving abrasive slurries, suspended and non-suspended solids and line-size solids.

    Small but Mighty Pump

    The SANDPIPER pump design offers a small footprint, making it an excellent choice for both portable and permanent applications. The superior suction lift capabilities, combined with its solids-handling capabilities, make it the ideal solution for sump and dewatering applications.

    The bottom discharge porting prevents settling solids from damaging the diaphragm and shortening the pump life. HDF1 pumps are thick wall-constructed of sand-casted aluminum, cast iron and stainless steel with elastomer and TPE (thermoplastic elastomer) diaphragms and check valves.

    HDFI Heavy-Duty Flap Valve Pump Features

    • Port size: 1" NPT/BSP
    • Capacity: 0 to 70 gpm (265 lpm)
    • Suction lifts: best in class for a 1" pump
    • Air distribution valve: no-lube, no-stall externally serviceable air distribution system (ESADS+) design
    • Solids handling: up to 1" (25 mm)
    • Heads: up to 125 psi or 289 ft of water (8.6 bar or 88 meters)
    • Max operating pressure: 125 psi (8.6 bar)

    Chemical Compatibility Guide

    To determine chemical compatibility with this pump, please refer to our Chemical Compatibility Guide.

    ATEX CE logo ABS logo ISO Logo EAC


    Port Size

    1" NPT
    1" BSP
    Capacity 0 to 70 gpm (265 lpm)
    Air Distribution Valve No-lube, no-stall design
    Solids-Handling Up to 1" (25.4 mm)
    Heads Up To 125 psi or 289 ft. of water (8.6 bar or 88 meters)
    Displacement/Stroke .10 gallons (.38 liters)
    Max Operating Pressure 125 psi (8.6 bar)
    Shipping Weight
    Cast Iron
    Stainless Steel

    48 lbs (21 kg)
    76 lbs (34 kg)
    79 lbs (36 kg)






    HDF1 & HDF25 CAD Files

    SANDPIPER can provide you with a CAD file to save time and improve the quality of your final design, as well as reduce measurement and documentation packet errors. Contact us today to request yours.


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    SANDPIPER AODD pumps deliver industry-leading durability and performance. We offer the broadest range of products for a wide variety of applications. Contact a local distributor to find a SANDPIPER pumping solution that’s backed by superior quality and workmanship.

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