One year I had to replace two anti-siphon valves and it wasn't cheap. So I looked for an insulated cover that would work. Didn't find one. I drove to Walmart and spent $7 each on a soft sided cooler bag (the kind you bring the oranges and juice boxes in for the kid's soccer games) and then took some old rags/towels and some of those alligator clips you use for large stacks of paper that I had to hand. I wrapped up the pipes with the towels, and pulled the coolers over the top of the pipes and secured the bottom (couldn't close the zipper) with the alligator clips. It has worked well for several years.