Drum Safety Vent Body Material Polyethylene Color Yellow For Drum Orientation Vertical For Liquid Type Petroleum For Plug Size 2 in Includes Flame Arrestor Yes Minimum Opening Pressure 3 psi Overall Height 4 in Overall Width 5 in Pipe Size 2 in Thread Gender Male Thread Type NPS NPT Vent Type Pressure Vacuum Relief Vent Flame Arrestor Material Plated Steel For Drum Capacity 30 gal 55 gal