Key Specifications / Parameters Parameter Description / Value Part Number RPACKX00102 Stem Size (Nominal) ⅜″ (9.5 mm) Packing Type Single graphite ribbon + graphite filament packing Material Graphite ribbon/filament Included Components Graphite filament ring, graphite ribbon ring, lantern ring, packing box ring, packing follower Special Requirement Use one sacrificial zinc washer (0.004″ / 0.102 mm) beneath each graphite ribbon ring Application Valve stem sealing in sliding‑stem valves