While you need to be able to reach the back side of the WH, the access may be from one side or the other and not necessarily directly from the back.
There may be a panel held in place by a couple of screws or some other place that you can reach the back of the WH to flip the valve.
One person found a panel at the back of a cupboard that was the access.
It's there, you just have to look hard enough.
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'11 Cougar 326MKS loaded with mods
'12 Ford F250 SuperCab 6.7 PowerStroke Diesel
Amateur Radio: KD2IAT (146.520) GMRS: WQPG808 (462.675 TPL 141.3)
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