Start with the fitting that will connect to your air hose. Take it to a plumbing shop and build your adapter from there ending with a fitting that will connect to your water system. I have a 1/2" ball valve in my adapter so I can allow the compressor to recharge the tank and so that I can make the connections easier. I blow from the place my backflow preventer was ( I remove it for the winter) so I attach the adapter to the main line with half of a 1" copper union. Then each zone is opened individually and blown with 2 tanks of air. Just a few fittings sweat together except for the valve and the air hose connector. I snug the union together, but I don't worry about 100% air tight. Gonna do my system tomorrow.