Gene,
I have the manual valve, but I learned from Steve and Chuck who traced it down that there is also a check valve on the outlet end of the hot water tank (I didn't know that). I believe it is necesary to make the bypass work. Theoretically the bypass is a hose that bridges from the pressure side of the tank to the outlet side bypassing the tank. The manual valve is on the pressure side, but would backfeed right back into the tank through the outlet end if it didn't have a check valve.
Brad
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