Eastman TEFT Engineering [P] Ltd. Offers Heavy Duty Flap Pump. Eastman TEFT Engineering [P] Ltd. Supplies pumps and connectors. Heavy Duty Flap Pump is recommended for abrasive slurries, suspended and non-suspended solids and line size solids requirements. Heavy Duty Flap Pump is configured in bottom discharge porting arrangements. This pump has the thick wall constructed of sand casted aluminum, cast iron and stainless steel w/elastomer.