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 5999-01-010-1995
NSN 6240-01-423-0605
NSN 5960-01-399-4327
NSN 5985-01-221-2867
NSN 6135-01-290-6487
NSN 5930-00-578-1008
NSN 6105-01-144-4467
NSN 5945-01-216-1683
NSN 5990-00-232-3965
NSN 5925-00-092-0578
NSN 6320-01-322-8340
NSN 5975-01-119-0190