Have you installed the Python line sets? I used it on the @viessmann_us mini split install for the #auneshop It’s pex-al-pex. The flare adaptors are first installed on the unit side of the head and condenser. A prep tool is used to chamfer the cut ends of the pipe. The final is a compression nut and ferrule, just bottom-out the nut with a hold-back wrench on the adaptor. This vitocal-100 was 3/8” & 5/8”. Ngl the 5/8” connections weren’t super easy. With high copper prices or as an anti-theft (th