Control city water supply with 12v water valve

I also try to remember to shut off the water-- usually it's when I'm in the toad and getting ready to go somewhere. I found a 12v valve and RF key fob operated relay on ebay. I haven't installed it yet, it will be in the wetbay adjacent to the hose reel. ---- the parts are at home, about 2000 mikes away. It will get installed when I return in the fall.