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Winterizing goes a lot faster once a bypass kit is plumbed in, since you're no longer forcing antifreeze through a 6-gallon tank you don't need to protect that way. Install it once behind the water heater access panel and every future winterizing or de-winterizing job is a matter of flipping valves instead of disconnecting hoses.
A one-time install that pays for itself the first winterizing cycle in antifreeze saved.