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 6620-01-439-5473
NSN 5855-00-973-5717
NSN 5855-01-431-5581
NSN 6220-00-689-5469
NSN 2925-00-660-8131
NSN 5990-01-138-8981
NSN 6620-01-106-3553
NSN 5835-01-504-0837
NSN 7035-00-946-2642
NSN 6650-01-190-2304
NSN 5925-00-969-3090
NSN 6220-00-559-3555