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 5975-01-539-0160
NSN 5998-00-690-9973
NSN 6110-01-250-2936
NSN 6610-00-303-0338
NSN 6645-01-508-4012
NSN 5835-00-350-3703
NSN 5925-01-320-6905
NSN 5835-01-025-8761
NSN 6620-00-035-5813
NSN 5985-00-231-8172
NSN 5945-01-099-0981
NSN 6685-01-429-2360