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 5905-01-634-0595
NSN 5999-00-232-7572
NSN 6145-01-401-3713
NSN 6105-01-618-5423
NSN 5950-00-155-8340
NSN 5990-01-651-0170
NSN 2925-01-359-4027
NSN 2925-00-026-0005
NSN 6645-01-046-8849
NSN 6145-01-479-6848
NSN 5855-01-017-7366
NSN 5910-01-396-5491