The Manual Quantum Abrasive Metering Valve (MQV) is an easily adjustable, manually-operated, abrasive media valve for use with all common abrasives, including minerals, slags, and metallic. It is specially designed for precise metering and easy measuring for both contractor and classic blast machines with a 2 cuft capacity and larger. This manually-operated abrasive metering valve has a 1-1/2" NPT connection to the pot.