If your house’s water is supplied by a municipal water system and you do a lot of work outside with a garden hose, use a vacuum-breaker fitting threaded onto the end of the hose bib (the valve mounted on the outside of the house). These fittings prevent back flow from a garden hose and attachments in the event of a massive shift in pressure. Some municipalities require their use, and they’re not a bad idea even if you have a well.
Suppose you’ve left a garden hose in a bucket of sudsy water and the severed-fire-hydrant scenario occurs. The vacuum breaker prevents water from being pulled out of the hose and bucket and into the municipal water system. If you’re replacing a hose bib, use a freeze-proof type with a built-in vacuum breaker. Common sense measures apply too. For example, don’t leave a hose unattended in a bucket and don’t leave a hose laying in a puddle on the lawn.
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