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These useful devices are located inside a crossover and can be used to prevent leakage of drill fluid from the drill string when making connections, especially when the exit point is above entry point.

SlimDril modify these valves to accept a wireline so they can be used during pilot and reaming stages.

They can also be used to replace a blank sub allowing fluid to be pumped from both entry and exit side and can also be fitted directly into a new reamer, saving the cost of a blank sub.

A full range of sizes from 3” to 8” diameter available and SlimDril supply the subs to go with them to.