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 5985-01-303-5984
NSN 5975-00-561-8238
NSN 6130-01-179-8480
NSN 5835-01-398-3859
NSN 6610-01-529-2337
NSN 2925-01-556-0333
NSN 6240-01-306-4320
NSN 4140-01-201-4359
NSN 5990-01-476-9956
NSN 6685-01-529-6428
NSN 6105-01-469-6027
NSN 6645-01-400-2119