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 2925-01-446-6523
NSN 6145-00-256-3984
NSN 4140-01-568-2815
NSN 5930-01-150-1785
NSN 6685-01-408-6372
NSN 6650-01-327-3068
NSN 5945-01-158-7886
NSN 6320-00-313-9114
NSN 5945-01-020-7897
NSN 6240-00-863-6105
NSN 5999-01-082-2182
NSN 6685-00-053-5558