Description Manuals Videos Articles Popular Accessories Clemco Part # 22764 is the Metering Screw for the Manual Quantum Valve (MQV) knob. Manual Related Parts (1) Parts Included (1) Clemco Manual Quantum Valve, MQV #22845 $493.29 462 Customers Also Viewed MQV Metering Plate & Shaft #22763 $108.99 Pulsar Plus VI-S Suction Cabinet #29383 $20,358.00 Pulsar Plus III-S6 Suction Cabinet #29393 $18,498.38