Allows two 18,000 BTU indoor units to be used. Requires special piping; limited to only 18,000 BTU models. Total BTU capacity is limited to 31,600 BTU in cooling. The kit upsizes linesets to 3/8" and 1/2".
Note: This kit is a replacement for previous model # K9M1818 and is also compatible with AOU36RML1.