David, Use the lower of the two drain valves. Keep the top one closed while you are blowing out the lines. You can buy a fitting that will be quick disconnect on one end for the compressor hookup and i think it's 3/8 male on the other. Home Depot has them or any local plumbing shop that carry's sprinkler accessories. I used a borrowed 5.5hp 25 gal craftsman that only gets to about 8cfm at 40 psi. It did the job but slowly. Rentals were $75 per day for the same size compressor and $5 for the fitt...
I have a conbraco PVB on my home irrigation system and am interested in blowing out the lines in preparation for the upcoming winter. There is no fitting/spigot between the PVB and the lines to connect my compressor. Where do I connect my compressor[?][?]
