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 4140-00-555-1776
NSN 5915-01-503-0855
NSN 5996-00-143-4783
NSN 2925-00-524-4688
NSN 5855-01-574-3597
NSN 5920-00-539-6989
NSN 7035-01-492-0419
NSN 6650-01-381-7172
NSN 5950-00-530-7273
NSN 5950-01-090-5792
NSN 5855-00-973-5717
NSN 5935-01-159-7401