HDF3-M / HDF4-M Air Operated Double Diaphragm Heavy Duty Flap Metallic Pump | Sandpiper

HDF air operated double diaphragm pumps are recommended for abrasive slurries, suspended and non-suspended solids and line-size solids. All SANDPIPER® Heavy Duty Flap Pumps are configured with bottom discharge porting to prevent settling solids from shortening pump life and provide superior suction lift. HDF3-M/HDF4-M pumps are thick wall constructed of Cast Iron with elastomer and TPE (thermal plastic elastomer) diaphragms and check valves. See tabs below for a complete description.


Port Size
3″ 150# ANSI Flange
4” 150# ANSI Flange
0 to 260 gpm (988 lpm)
Air Distribution Valve
No-lube, no-stall design
Up to nearly 3″ (75 mm)
Heads Up To
125 psi or 289 ft. of water (8.6 bar or 88 meters)
.026 gallons (.098 liters)
Max Operating Pressure
125 psi (8.6 bar)
Shipping Weight
Cast Iron: 390 lbs. (176 kg)

Click here for HDF3/HDF4 Metallic Data Sheet.