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 5990-01-565-2226
NSN 5945-00-890-5815
NSN 6240-00-467-7295
NSN 6110-00-111-2761
NSN 4140-01-095-8466
NSN 6650-01-024-9554
NSN 6620-01-449-3101
NSN 6145-01-074-2200
NSN 5930-01-510-9130
NSN 6320-00-701-0437
NSN 5965-01-324-6583
NSN 5950-00-111-2000