Friedrich T42350 35 ft refrigeration line set for all 18000 BTU/h indoor units. Insulated tubing sets are available for all Friedrich split systems in 15 ft. and 35 ft. lengths. Each tubing set is equipped with flare nuts on both ends. Both liquid and suction lines are insulated. Tubing sets can be joined together with field supplied double female connectors. Each system requires one tubing set unless otherwise noted above.