... union for wellhead: Certification:API 6A Application:oilfield equipment WP:High pressure API 6A high pressure union for wellhead High ... ANSI Standard and the technology indexes conform to API Spec 6A, the product adopts some end connections of pipeline thread, ... ;oil field equipmentShanghai Jefa Machinery Co.,Ltd specialize in API 6A products as following:1) Wellheads (casing/tubing head, crosses ...