IMPORTANT NOTE: thread is straight (parallel) BSPP (G) and is the same diameter all ay thought the part. (see drawing and pictures)! Stainless steel 304 weld-on bung for installations in corrosive environments. Threaded for standard G 3/8″. Fits through 7/8″ hole. Easy weld with 0.2″ top head border. Laser engraved on top face for easy identification. Let us know if you have any questions.