According to actual needs. there are circulating sub with casing thread and circulating sub with union thread.

根据需要可分为套管螺纹循环接头和油壬螺纹循环接头(全规格)。

youdao

According to actual needs. there are circulating sub with casing thread and circulating sub with union thread.

根据需要可分为套管螺纹循环接头和油壬螺纹循环接头(全规格)。

youdao