Key Specifications / Parameters Parameter Description / Value Part Number RPACKX00042 Packing Type Double PTFE V‑ring assembly Compatible Stem Diameter ⅜″ (9.5 mm) Material PTFE (TFE) V‑ring packing rings Kit Contents Packing rings, upper wiper, packing box ring, lantern ring (and an extra packing ring in kit) Application Stem sealing/packing replacement in Fisher sliding‑stem control valves Additional Notes The installation instructions note the kit “contains one extra packing ring (key 7)” which is to be discarded during assembly.