... .Accurate screw thread4.Best price with High quality5.Suitable:oxygen,co2,acetylene,etcAbout products:1. Inlet & Outlet thread: as per ... is allowed.About us:We are NINGBO ZEHEN INTERNATIONAL TRADE CO., LTD, which is a leading company of exporting welding ... series in China, owning the manufacturer of ZENYUAN WELDING & MACHINERY CO., LTD which specializes in producing cutting torch, regulator & welding ...