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 5925-01-574-8523
NSN 5920-01-319-6790
NSN 5985-01-216-8993
NSN 4140-01-512-0744
NSN 5920-00-231-2781
NSN 6645-01-030-0662
NSN 5990-01-129-7701
NSN 6105-01-516-3392
NSN 5975-00-269-8391
NSN 6610-00-104-7518
NSN 6650-01-231-4169
NSN 5998-01-204-5426