A cable modem that supports stateless requesting andor limited contention-based requesting is provided herein. According to selection information from a safety function selection unit 120, a function setting unit 116 sets arbitrary function among a plurality of functions as safety function pertaining to usage of a gas. When the TVE is heated above the LCST, interaction between the hydrophobic groups of the polymer and the VES form a cross-linked network to increase the viscosity to transport proppant into a fracture. The flash card reader includes a CompactFlash connector, coupled to the IDE converter, for receiving a CompactFlash card through a single slot in the single-slot multi-flash-card reader, the CompactFlash connector making electrical connection with the CompactFlash card for signals in the CompactFlash interface. One of the closure member and the valve seat includes a plurality of annular ribs, and at least one of the valve seat and the closure member defines at least one groove to be positioned between at least two of the annular ribs to receive material from a sealing surface between the closure member and the valve seat when the closure member is sealingly engaged with the valve seat. A first inlet into the chamber is provided for establishing a sealed communication with the irrigation needle and a second inlet is provided for establishing a sealed fluid communication with an aspiration needle.