I have (4) frost free hose bib's one on each side of our home. When I have a garden hose hooked up to a watering wand and pull the trigger the hose bib vibrates. It will continue to vibrate if I don't pull the trigger/valve wide open - full flow. It will also vibrate when the hose is hooked up to a soaker hose with the hose bib opened a half turn or so. One of the hose bibs will also vibrate when the washing machine is filling or when flushing the toilet in the guest bedroom. We built our home 3 years ago, the hose bib vibration (noise) started last year. Do I need to replace the frost free hose bibs?

Could it be the anti-siphon valve?

Does the bib have a little cap-looking thing on top of it? Is that the part that's vibrating?

The anti-siphon valve is a diaphragm that closes under pressure, but opens normally to eliminate the possibility that a hose left in a bucket of not-so-clean water could allow some of that contaminated water back into the house system.

~aaron



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