... of ring joint gaskets(RTJ) in China, including octagonal and oval gaskets with R, RX, BX, IX series, which are widely used ... have certified API and ISO9001:2000, therefore, our products comply with ASME B16.20 standard and API spec 6A .Moreover, we ... your reply.FancyWenzhou Huahai Sealing Co.,LTD Lens Metallic Gasket with API