The front brake port is 9/16" and the rear port is 1/2". This is for the Wagner master that is recommended. The stock line to the distribution block is 1/4" and I am going to keep that size so they make an adaptor from the 9/16 to the 1/4" line. The rear lines will remain 3/16" so an adaptor is required to go from 1/2" to the 3/16" line.
However, if you flare your own lines, you can get a nut for the line that fits right into the port without the adaptor. I am using pre-flared lines, so an adaptor is needed.