These plugs are NACE compliant, conforming to NACE MR0175, which means that they meet to the requirements of the oil and gas industry. Both the body and nose are MP35N, the O-Ring is FKM, and the back-up rings are PEEK. Dual Sealing A.F.O. Plugs offer exceptional corrosion resistance and sealing performance in high pressure, high temperature applications. Standard part numbers will be offered in three thread sizes, 0.312, 0.375, and 0.500 inches. Contact your Engineer to find the right solution for you.