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 6145-01-303-5718
NSN 5910-01-094-6168
NSN 6610-00-520-6193
NSN 5920-01-607-0416
NSN 5915-00-957-6970
NSN 5945-00-598-6130
NSN 6685-00-257-4088
NSN 4140-01-600-9879
NSN 6685-00-177-6491
NSN 6135-01-528-0699
NSN 5999-01-053-9931
NSN 6650-01-399-8552