The Variac is a variable AC transformer that provides 0-120 Vac output voltage to the MagnaValve. With zero volts applied to the MagnaValve, the permanent magnets hold the shot. Application of voltage will cancel the permanent magnets’ holding force and allow the shot to flow. Higher voltages will provide higher shot flow rates. The Variac is included with the VLP1000VAR MagnaValve and the LP2000VAR MagnaValve and can also be purchased separately.