Warren Rupp”s Sandpiper AODD heavy-duty, flap-valve (HDF) pumps are designed for abrasive slurries, suspended and nonsuspended solids, and line-size solids requirements. All HDF (SA) pumps are configured in bottom-discharge porting arrangements. HDF pumps are thick wall constructed of sand-casted aluminum, cast iron and stainless steel with elastomer, TPE (thermal plastic elastomers), and PTFE options in diaphragms and check valves. HDF pumps are enhanced with an extended wear package.