A relatively thin metallic item, having a concave or cupped contour, designed to effect its own seal by compression against the circumference of a hole. It is used as a blowout plug in boilers, engines, and the like to relieve the pressure created by the expansion of fluids caused by heat or freezing.
Classification: Parts for steam or other vapor generating boilers and super-heated water boilers, except heat exchangers
NSN 4140-01-389-8523
NSN 5960-00-803-2977
NSN 5930-01-207-9694
NSN 5855-01-312-5160
NSN 6150-00-964-2608
NSN 6110-01-431-6906
NSN 6320-01-421-3777
NSN 4140-01-109-5050
NSN 6135-00-145-8884
NSN 5855-00-310-2740
NSN 5895-01-146-3023
NSN 6145-01-527-2528