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 5985-00-430-1583
NSN 5996-01-599-4097
NSN 6650-01-078-7732
NSN 7035-01-298-5154
NSN 5945-01-307-9529
NSN 5930-00-221-5070
NSN 4140-00-990-3311
NSN 4140-01-607-7799
NSN 6610-01-175-9045
NSN 5990-01-443-2931
NSN 5925-01-054-3783
NSN 6650-00-999-8902