The Sandpiper line of Heavy-Duty Flap Valve Diaphragm Pumps are engineered to pump larger solids than traditional diaphragm pumps that have ball valves.  These air-operated diaphragm pumps work well with abrasive slurries and viscous sludge. They handle up to 2” solids and have a unique bottom discharge port that offers superior suction lift and avoids damage from settling solids.  Thick-walled constructions and heavy-duty pump features make these Sandpiper pumps particularly rugged for long-life and extended wear.