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The reversing sub
The reversing sub is aIso called reversing spers which is a special tool for revering stuck drill stem above stuck point in drilling and work over operation.In treatment of stuck drill stem.it can work as a fishing pin tap in reversing operation.
When fish is stuck or can not be reversed in fishing or reversing operation?Dthe fish can be reversed from reversing sub and the fishing drill tool can be tripped 0ut.

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