1.Type :R.BX.RX 2.Shape:octagonal,oval,lens 3.Size:R11-105,RX20-215,BX150-303,Inch1/2"-24" Ring joint ... gaskets are designed in oval/octagonal shapes confirming to R,Bx and Rx series of API std 6A.1.Type : ... R.BX.RX 2.Shape:octagonal,oval,lens3.Size:R11-105,RX20-215, ... BX150-303,Inch1/2"-24"4.Certificate:API 6A,ISO9001:20005.Pressure:PN2. ...