New answers tagged valve
Go to basement, garage sale, or thrift store and pick up an old, regular screwdriver about the right size to fit the slot in the lighter. Use a file, hacksaw, angle grinder or mototool type device to cut a slot in the screwdriver. Make the slot big enough to fit around the gas nipple. Unscrew as needed.
You can put a shutoff in the yellow area if there's nothing ELSE feeding off the hidden part of the waterline. If there was a shutoff above the ceiling it should have an access panel, but code violations are a dime a dozen with things like this. Given the "handle-fall-off" situation I'd suggest overcoming whatever fear of drywall repair may be holding you ...
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