Where does the backflow preventer go?
I'm roughing in a future connection to my watering system (was decommissioned some time ago, so I'll have to do some repairs to get it working) in a spot that's going to be insulated in such a way it'll be hard to plumb.
So, question is, which order is it? Watering system shutoff with drain, then backflow preventer, or is it the other way? I'm assuming the latter.