Very useful item
I love the function of this alternator valve -- it allows a single outlet timer to alternate sending water to one system on one cycle and another system on the next cycle. You can also manually switch it if you just want to test it. I had a little trouble when one blew apart, but Dripworks replaced it right away. It may have been cracked in assembly, but the others I have continue working just fine. The literature says it can handle up to 120 psi, but a pressure regulator may be a good idea. I love that it's simple, operates on water flow alone, and effectively turns a single outlet timer into a dual outlet timer. I have the timers set to water one system one day and another the next, but you could program your timer to water both systems in the same day just by having it operate twice a day.