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It is mainly used to connect two or three kinds of oil casing and wellhead devices with different specifications, different diameters and different screw types.

It is mainly used to connect two or three kinds of oil casing and wellhead devices with different specifications, different diameters and different screw types.

Application: It is mainly used to connect two or three kinds of oil casing and wellhead devices with different specifications, different diameters and different screw types.

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