Line sets are required when installing a Mr. Cool Mini Split System. Mr. Cool Line Sets are available in 16' and 25' lengths. Sometimes an installation may require a longer length. By adding a coupler you can connect two lines together to extend the length of your line set. Up to 3 line sets can be connected together, giving you the possibility of a 75 foot length. Keep in mind that the total length for any Mr. Cool multi-zone system is 197' with a 75' maximum per zone. If you are connecting three lines, you will need 2 couplers and 75 ft. of communication wire.
The DIYCOUPLER-3858K75 is a set of two 3/8" x 5/8" couplers. It includes 75 feet of communication wire for an unbroken run of wire from your indoor unit to your outdoor unit. Simply disconnect the 25 foot length of wire pre-attached to your indoor unit and replace it with the new 75 foot wire. It is for use with the 24,000 or 36,000 BTU indoor wall units.