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 5935-01-303-7895
NSN 5985-01-233-2868
NSN 6220-00-205-2040
NSN 5950-01-306-7026
NSN 5985-00-877-9568
NSN 5945-01-608-2409
NSN 5990-00-068-3592
NSN 5915-01-073-6753
NSN 6320-01-512-2031
NSN 5855-01-103-8650
NSN 2925-00-063-5898
NSN 5960-01-495-0859