3/4 Tube x 1/2 Tube PTFE tube compression reducing union with body and ferrules made of virgin PTFE. The nut and gripper are made of PVDF. Performance at ambient room conditions: 120psig for 1/16 fittings linear, decreasing to 80psig for fittings, and 60psig for fittings larger than 3/4. Performance at elevated temperatures up to 85C/185F: 90psig for 1/16 fittings linear, decreasing to 60psig for 3/4 fittings, and 40psig for fittings larger than 3/4.