La Marzocco GS3 AV Auto Volumetric Espresso MachineThe La Marzocco GS3 AV (auto volumetric) is a dual boiler espresso machine with a saturated group head, PID temperature control, shot timer, a cool touch steam wand, a cool water mixing valve, and a rotary pump that can be direct plumbed or run on its internal, 2. 5 liter reservoir. Every component found in the GS3 AV is built to La Marzoccos commercial standards, delivering incredible power, control, and classic Italian styling to your home. The La