One example embodiment includes a retractable leash for restraining an animal attached to the retractable leash. Said one or more channels of the device comprise at least one channel having at least one orifice of a predetermined hydraulic diameter configured such that a flow of said predetermined fluid through said orifice and through said channel thereby generating a vortex ring-like fashion of the flow within the channel to provide efficient heat transfer by the fluid. When the compression is removed, fluid is pulled back down through the tube and stops when the fluid level in the other reservoir reaches the top of the tube. The accessory may be a sound suppressor, and the latch may serve to secure the gas regulation element against position change. This reduces the likelihood of the surgical instrument skidding on the surface of the bone tissue and thereby increases the precision of the hole.