A single- or double-lumen (coaxial) tube in a straight or spiral design intended to be used to conduct compressed gas from a source to a dental drilling system handpiece to provide power to the turbine. The device is of an adequate length to provide manoeuvrability of the handpiece. The coaxial types have a double tube (inner and outer tubing) to facilitate the removal of the exhaust gases. This is a reusable device.