I have been invited to install a VRF system in a large apartment. During the visit to site I have seen that the pipes and cables have already been laid down. The pipes were mostly laid out in pairs of 1/4 - 3/8". i usually work with Mitsubishi Electric which has all of its indoor units with liquid/gas lines 1/4 - 1/2". I really like to perform this job with Mitsy since they are very good customers but I dont know if I can use their piping. Any suggestions?