A single- or double-lumen (coaxial) tube in a straight or spiral design intended to be used to conduct compressed surgical-grade air or nitrogen (N2) gas from a gas source, usually the central medical gas supply system, to a surgical drilling system or sawing system handpiece or motor to supply it with power. The device is usually from 2 to 5 meters in length. The coaxial types have a double tube (inner and outer tubing) to facilitate the removal of the exhaust gases. This is a reusable device.