A 3/4 inch anti-siphon valve runs around $17. I would be willing to pay double that (maybe more) if the valve measured water volume usage. I would like an actual flow measuring device in the valve such that if the valve was not working you would see the volume drop off. It could be WiFi but I thought it might be possible to run a signal over the existing line similar to powerline Internet. I think it would compliment your hardware line as you would have a smart controller with smart valves.
