ARO Drum Pump Package. EXPert Series DAB05. 1/2" Diaphragm Pump, 11 GPM Flow Capacity, 1:1 Ratio, Drum Mount. Aluminum Pump Housing, Stainless Steel Seats, PTFE Pump Diaphragm and Balls. Package includes: Pump, Bung Adaptor, Air Safety Shut-Off, Siphon Tube, Weather Seal and Base.ARO Drum Pump package components contain pre-specified, matching materials of construction for complete fluid compatibility. This package is compatible for use with solvents. Please refer to the chemical compatibility guide for the specific material you are pumping.