Hello All: Thanks for all the good information. I just finished blowing out my sprinkler system. I attached a standard air nipple to test cock #4 on my Wilkins RP 975xl. It worked just fine. It took me a lot longer than I would have liked because my compressor isn't all that big, but I let the compressor build up to 140 lbs and adjusted the output t0 limit the pressure to 80 lbs. I blew each run until there was no mist of water at all (maybe even over kill). Also, I took everyones advice and com...
Thank you for the fast reply. The device is located outside and, unfortunately, there is absolutely no other port. Thanks again.
Hello. Please help me out. This is what my RP and set up looks like. Without taking the valve assembly completely out, where would I place the pipe for the air pressure to blow out the lines/heads? The water flows from right to left in the picture. Test cocks are shown and are left to right numbers 4,3,2 and 1. A local plumber (unfamiliar with this type valve) suggested an air nipple in test cock #4 (leftmost in picture.) I thank you all in advance for your help. advice and consideration.
