A better garden hose rig

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If you haven't spent a serious amount of time spinning the tiny metal wheel at the end of the hose trying to connect it to the wall mount, this might not look like anything important, but it is.
Interesting, good to see some new ideas in this area. Looks like some clear benefits for cold climates. Not sure about the auto-turn-on functionality though. What happens when you unhook the hose while there's pressure in it?