Abstract: A compact, inexpensive and light-weight apparatus, for quick connection to a standard supply of liquid carbon dioxide at room temperature, includes a stiff length of tubing quickly connectable to the source of liquid carbon dioxide. This tube, in a preferred embodiment of the invention, provides all the support needed for the rest of the apparatus, which includes a manual control valve to regulate a flow of the liquid carbon dioxide, a heat exchange coil across which heat transfer takes place to cool the flow of liquid carbon dioxide, an expansion nozzle and a foraminous bag attached to the outlet of the expansion nozzle. An insulation cover is provided to surround the foraminous bag and heat exchange coil and to allow passage of gases therethrough.

Abstract: A valve holder and a method of use thereof enables convenient securing and releasing of a valve, such as a stopcock valve. The valve holder allows an operator to operate a valve utilizing one hand. The valve holder includes a support block and a chamber fixed to the support block. In operation, the chamber receives a valve to be secured by the valve holder and a clamp member is tightened to the support block to thereby secure the valve in the chamber. A hand operated mechanical fastener such as a thumb screw is utilized to tighten the clamp member to the support block. Cooperating recesses in the chamber and clamp member secure the valve in the holder and prevent movement of the valve within the holder.