CPS CR Series Recovery Tank Overfill Protection Kit provides a safe means of recovering refrigerant into a cylinder without the worry of overfilling it causing a potetially hazardous situation. Normally the technician would have to be present to safely recover with a scale, now you can hookup and walk away with out fear of overfulling your tank. When the recovery cylinder reaches 80% capacity, the unit is shut off via a relay in the machine. Simply change cylinders and restart the unit. Works with any size cylinder with a 3-pin Brad Harison Plug and includes a shorting cap for working with tanks without a float.