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The oilfield circulation sub is a specialized tool for circulating drilling fluid when running in casing on the way or finishing running casing down hole. Based on the actual needs, there are circulating sub with casing thread and circulating sub with union thread (All sizes) are for optionChina Cementing Tools
website:http://www.jayapetro-tech.com/oilfield-tools-supply/cementing-tools/

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