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Bit Sub

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Most subs are used as an adapter between two different connection types in the same drill string. Often times the connection on drill pipe will differ from that of the bottom hole assembly. A bit sub is a sub that is used just above the bit and serves as a crossover between the drill collar connections and the bit connection, and it also houses the float valve, which is basically a one way fluid valve that allows drilling fluids to pass out of the drill string and into the bit, but does not allow those fluids to back-flow into the drill string.

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