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 5925-01-600-6772
NSN 6620-01-598-2271
NSN 6240-00-158-2808
NSN 5905-01-482-9833
NSN 7035-00-557-5570
NSN 6610-01-631-1184
NSN 5910-00-202-1056
NSN 6130-01-367-0190
NSN 5999-01-474-5011
NSN 4140-01-386-1447
NSN 4140-01-024-9414
NSN 2925-00-115-5857