Specifications:Material: 304 stainless steelSize: 20AN (1-5/8x12 UNF) male weld-in bung fittingFeatures:- Stepped on weld end to assist mounting- These weld bungs are ideal for use with fuel cells, radiators, oil pans, oil coolers, catch tanks, swirl pots, or any other project that requires custom plumbing- Capable of handling high pressure applicationsNotice: Professional installation is highly recommended! (No instructions included)