A system and method for seamless switching and concatenation of compressed audio streams in Internet, Digital Radio, Digital Television, DVD, storage, and other applications. Embodiments include a pump with venting and non-venting piston return, a pump with stirrer and direct feed mechanism, a pump with CAN system and self-diagnostics, a pump with heated housing and reservoir and a pump with stepper motor and overdrive control. A bid for the item is received from a first bidder which is currently a high bid for the item. Heat dissipating fans assembled to an identical lateral side of the heatsinks blow cold air to fins of heatsinks to increase heat-dissipating efficiency.