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 6135-01-344-9766
NSN 5835-01-041-0873
NSN 5895-00-005-8758
NSN 5855-00-010-6492
NSN 2925-00-059-7991
NSN 5905-00-206-1943
NSN 5945-00-999-9519
NSN 5905-01-048-8170
NSN 5935-01-609-3931
NSN 6220-00-186-8565
NSN 5975-01-600-3553
NSN 5965-01-087-0873