I agree they are not for everyone. They do come in handy in certain situations. I have the "remove before flight" ones on items that are easy to overlook.
I put a wye on the campsite water hook up so I can run water into the coach and another hose outside with a backflow preventer. We recently had to bug out in moderate rain and it was a mess. I thought I was all packed and ready to go ... when I got in the cab I saw the red flag on the water hookup in the side mirror - I forgot to unhook the wye. Saved me a few buck that day.
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