Key Specifications / Parameters Parameter Description / Value Part Number RPACKX00052 Stem Diameter (Nominal) ½ inch (12.7 mm) Packing Type Double PTFE V‑ring packing Material PTFE (polytetrafluoroethylene) Compatible Boss/Yoke Diameter Yoke boss approx 2‑13/16 inch (≈71 mm) Max. Service Temperature* Approximately 450 °F (≈232 °C) Application Packing kit for stem sealing in sliding‑stem valves with ½″ stem size