Gas and Bung Wrench Non Sparking Solid Drum Bung Nut Wrench Multi-Pack Bulk Discount (BLUE) (1) Back side of wrench used to open emergency gas meter shut off valves Gas and Bung Wrench Non Sparking Solid Drum Bung Nut Wrench Multi-Pack Bulk Discount (BLUE) This can be used to open the 3/4" bung found on most smaller barrels. Most 15 gallon drums there is a larger 2" bung and a smaller 3/4" bung. Non Sparking Solid Drum Bung Nut Wrench