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 5960-01-205-4868
NSN 5855-01-195-2518
NSN 5996-01-599-1517
NSN 5895-00-003-1558
NSN 5996-01-136-3751
NSN 5925-00-007-3962
NSN 5965-00-170-5254
NSN 5990-00-150-6979
NSN 5945-00-925-2055
NSN 7035-01-644-9583
NSN 4140-00-791-0500
NSN 5985-01-132-6594