News:
I could not find one so I bought a brass ball valve at home depot. My hose is 5/8" and no one seems to make one that size so I went with a 1/2" with the brass barb fittings 5/8" down to 1/2" to adapt. I flipped the lever facing down to hide it. Not the prettiest thing but it works!
http://www.amazon.com/Four-Seasons-74828-Heater-Valve/dp/B001B7BUAU/ref=zg_bs_15723841_8And a standard cable under the dash & you can turn the heat on/off from the drivers seat...