api 5000Beware, some suppliers and manufacturers supply normal A105N 36K material flanges stamped as 3,000 or 5,000, these interconnect with API sizes (example a 2 ANSI A105 1500 class flange rated at 3,700 psi CWP is the same asOur ring joint gaskets are strictly manufactured as per API-6A and ASME B16.20 specification. RX Series are available in low carbon steel and 316 stainless steel. RX Series ring joint gaskets