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A vacuum breaker is a backflow preventer. It’s a threaded device that attaches onto a faucet. It prevents water from flowing backwards into the plumbing. Vacuum breakers prevent water from flowing in the reverse direction.

Backflow occurs when water flows in the reverse direction. Imagine water flowing back into your faucet, instead of flowing outside like normal.

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Is there a device screwed onto your faucet’s mouth similar to the one pictured below? If so, you do have a vacuum breaker.

WattsBackflow preventer

I bought 2 hot+cold hydrants and 2 V2+hydrants from Aquor, and 3 out of 4 of those worked perfectly but one of the V2's would drip constantly after disconnecting the hose connector. Customer service responded quickly and walked me through some troubleshooting steps to try and dislodge potential debris that might not be allowing the operating rod to close all the way, and after that didn't work, quickly shipped me a warranty unit at no cost. We were under construction, and getting a replacement unit immediately was important, and it arrived within days. Once we removed the "defective" unit, we see that it isn't defective at all but the plumber didn't follow the instructions, and used teflon tape which gummed up the mechanism!

The pressure of flowing water pushes the valve open. When the water is turned off, the pressure decreases and the valve closes. The air pressure keeps water from seeping back into the spigot from the outside.

Simply put the house hydrant v1 is superior. I no longer have to worry about frozen spickets. Clean and modern looking, absolutely love the design and ease of use. Installation was a breeze

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We recommend the V1+ for retrofits and remodels. However, you must use the specific VB hose connectors to remain protected against backflow.

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Backwater valve

And my (very constructive) feedback: Aquor should put a large label on the hydrant itself, in both English and (more importantly) in Spanish, stuck to the hydrant in a way that hopefully forces someone to remove and read it before install, reminding them to not use teflon tape and that the o-ring built into the hydrant is sufficient to stop leaks, because nobody will read the manual. And I guess, never trust your contractor and watch everything they do, or... just do it yourself!

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The Vacuum Breaker Hose Connector has a vacuum-breaker built into the connector:   The House Hydrant V2+ has a vacuum-breaker built into the hydrant faceplate:

Check valve

We recommend the V2+ for new construction, or certain retrofits. ANY Aquor hose connector can be used while still providing backflow protection.

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Updated all of the bibs on the house. So far so good. Love them! Just have to get the right twist on the adapter so they are vertical. Practice will make perfect.

Plumbing codes vary, so check your local codes. If you’re retrofitting or remodeling, you might not be required to have one. Most new construction homes require them now. Even if you’re not required by code to have one, evaluate your risk level. If you’re filling buckets with chemicals in them, you’ll want backflow protection. If you’re using a spray nozzle, or only using potable water, there’s not much risk.

Normal water pressure keeps water flowing in one direction. For backflow to occur, the pressure needs to drop so much that it creates suction and pulls the water backwards. That’s not a problem with clean water. But you certainly don’t want any dirty or hazardous water flowing backwards into your home.