Ring Joint Gasket 1.Type: R,BX,RX 2..Size: R11-105,RX20-215 BX150-303, inch1/2-inch24 3 Certificate:API 6A, ISO9001 ... :2008 Ring Joint Gasket1.shape: Octagonal, Oval or lens2.type: R,BX,RX3.size ... : R11-105,RX20-215 BX150-303, inch1/2-inch244.certificate:API 6A, ISO9001:2000 ...