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Originally Posted by artdutra04
I originally tried to use the air at 90 PSI, but when you opened the faucet in the house and heard compressed air coming out, something's wrong!
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That is very very bad. If you try something like this, always make sure to use a backflow prevention device. Especially if you or your neighbors drink your tap water, you always want to prevent water from flowing from things like hoses back into your home plumbing. I'm not sure if a hose-bibb vacuum breaker would work in this case, but there are other backflow prevention devices that probably would.