Description Manuals Videos Articles Clemco 20499 - Sentinel Metering Plate and Stem (Course Abrasive) Standard Use, coarser than 50 mesh Sentinel Valve Item Number 11 Customers Also Viewed Clemco Sentinel Metering Valve for fine grit … #21439 $916.11 Sentinel Metering Plate, Urethane (Fine Abras… #21438 $98.41 Sentinel Seal Kit, Lower Segment #22389 $26.24