When an old anti-siphon valve began to fail (I'm not sure it was correctly installed anyway), the brand (Irritrol) was still considered to be among the best, thanks to my wife's landscape design consultancy. I punched in the part number on the usual search engine and saw a video posted by Sprinkler Supply for the exact SKU. It was straight and to the point, so it was only fair I ordered the part from them. The suggested additional parts made sense. Placed my order on a Sunday, and it shipped Monday. Although that's our only need at this time, I'll be sure to check out Sprinkler Supply Store in future.