<P> The simplest , most reliable way to provide backflow prevention is to provide an air gap . An air gap is simply an open vertical space between any device that connects to a plumbing system ( like a valve or faucet ) and any place where contaminated water can collect or pool . A simple air gap has no moving parts , other than flowing water . Many plumbing codes specify a minimum air gap distance required for various circumstances , such as a drain connection for a dishwasher , e.g. , BS 6282 . </P>
<P> The simplest , most reliable way to provide backflow prevention is to provide an air gap . An air gap is simply an open vertical space between any device that connects to a plumbing system ( like a valve or faucet ) and any place where contaminated water can collect or pool . A simple air gap has no moving parts , other than flowing water . Many plumbing codes specify a minimum air gap distance required for various circumstances , such as a drain connection for a dishwasher , e.g. , BS 6282 . </P>
what is the most reliable method for preventing blackflow
what is the most reliable method for preventing blackflow
an air gap
an air gap