1. Descriptions: The cementing head is a common cementing tool used as wellhead unit in all kinds of cementing operation. Comparing to cement-head with single plug, it owns longer cement-head body,and upper rubber plug and lower rubber plug can be put in at same time. The tool owns some advantages such as simple construction, easy operation, high pressure resistant, manifold in common use, flexible in connecting. Especially, the lever type indicator can shows whether rubber plug goes through double plugs cement-head to enter casing so that operator can determine easily. Not only common thread,also special thread cement head can be produced including NEW VAM,VAM TOP,FJ ETC. Main Parameters 2. Technical specification and parameter: Type ST35-140 ST35-178 ST35-140 ST35-140 Size 139.7(5 1/2") 177.8(7") 244.5(9 5/8") 339.7(13 3/8") Max.working pressure 35Mpa 35Mpa 35Mpa 20Mpa Casing coupling thread 5 1/2" LTC/BTC 7" LTC/BTC 9 5/8" LTC/BTC 13 3/8"LTC/BTC Manifold interface 2" union 2" union 2" union 2" union ID of plug container (mm) 125 160 225 320 Length of plug container (mm) 450 460 560 560 Overall length 1886 1972 1701 2210 -