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 6320-01-519-8767
NSN 2925-00-562-9866
NSN 4140-00-601-0452
NSN 5930-01-169-8909
NSN 6105-01-313-0293
NSN 5990-01-114-5095
NSN 5985-01-034-7523
NSN 6610-01-265-1824
NSN 5930-01-262-1662
NSN 6135-01-483-1501
NSN 5895-01-164-7981
NSN 6240-00-482-9188