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Circulating Sub



The Circulating Sub, normally run above a downhole motor, is designed to provide a means of communication to the annulus upon activation.
This tool utilizes a drop ball for actuation or may have a burst disc installed as a redundant backup incase the ball cannot reach the circulating sub due to an obstruction in the tool string.


• Prevents wear on motor.
• Provides communication with annulus.
• Dual option available with burst disk.
• Combines reliability with ease of use.


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