groz 45315 air operated transfer pump for dispensing def, choice of materials makes it compatible with many more fluids, compared to other air pumps which primarily pump oil. Built-in 2″ bung adaptor allows the pump to be fixed on drums with 2″ opening, pump position can be adjusted using the lock nut incorporated in the pump body. Air supply is provided via a ball valve connected to an air regulator which limits max. Air pressure to 100 psi (7 bar), supplied complete with suction tube with check valve for use with 15 – 55 gl (50 – 205 liter) drums.