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 6240-01-227-4178
NSN 6220-00-305-0801
NSN 5990-00-422-2093
NSN 6610-01-123-7292
NSN 6145-01-301-9506
NSN 5975-01-196-6903
NSN 6620-01-466-4436
NSN 5996-01-653-8065
NSN 6685-01-608-2187
NSN 5935-01-099-0008
NSN 5905-01-444-6478
NSN 6645-00-736-0476