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 5935-00-459-5555
NSN 5998-01-598-1851
NSN 5960-01-028-6375
NSN 6650-01-076-8625
NSN 6610-00-269-4506
NSN 5998-01-382-9869
NSN 6620-01-290-0197
NSN 6135-01-400-2947
NSN 5920-01-238-4983
NSN 5950-01-360-8728
NSN 5998-01-163-6104
NSN 4140-01-124-2954