Hose Bib Backflow Preventer

I show you in this video a hose bib Backflow preventer and how it works. It is often called a vacuum breaker or anti siphon device. It is designed to keep contaminated water from flowing back into your house. Current plumbing codes do require a hose bib vacuum breaker, anti siphon backflow preventer on each hose bib and I also recommend that you install these on your house if you do not have them based on the horror stories I've heard in the backflow continuing education classed I have taken. When everything on your house that has to do with water is working perfectly, you may not need a backflow preventer. But for the times things go wrong, you want to be protected with a backflow preventer on your hose bib as well as your sprinkler system and any other cross connection where contaminated water could be sucked back into the main water supply. I think it is wise to stay safe and have one of these vacuum breakers installed.

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[AmericanIrrigator]

Watch another video about the hose bib backflow preventer here:

[rfink]

My restricter sprays water when I turn on the water and turn off, it also leaks water everywhere while I'm using my sprayer. What a great device!

[ArmyRunner]

This sounds like something you don’t really need. How is the water going to back flow past a closed ball valve in the spigot?

[hollyraby]

Thank you for explaining what it is used for. I was going to remove the one's on my house, but now I see where I just simply need to replace them. AWESOME!

[WakeUpSmellTheCoffee]

I always thought my hose was broken. Now I know it was a backflow preventer doing its job from getting us all sick. LOL. Thanks!

[grt]

the only logical reason for this is: if the water supply to the house should get turned off, this may prevent contamination possibilities, otherwise when attached to a hose spigot, it's only purpose is to relieve pressure on a charged hose when the valve is turned off

[philg]

Pushing back the same water that's flowing out. Brilliant.

[canuck]

Always wondered why that connector sprayed water inside my garage every time I turned off the water. Annoyed me for years until I finally had enough and removed it. Thanks for letting me see what was going on. Poorly designed fix for a problem that doesn't exist. If the faucet is turned off, water can't backflow past it into the house anyways.

[MBZS]

This is great info. I thought something was wrong with my spigot since water was squirting out after I turned off the water hose. I didn't even know I had a blackflow preventer installed.

[Yarraman]

Thanks, mate! A very good demonstration of how backflow can occur & why a Vacuum Breaker is important.

[RK-hizz]

Thank you for the ultra clear explanation and demo. Right now I have no back flow preventer but I only have a garden hose + nozzle connected to it. No contamination possibilities. But I am thinking of installing a drip line system for automatic watering and I didn't understand why they were talking about back flow preventers. Now I do. It is very clear. Thank you very much for your video.

[CBReal]

THE BEST DEMO with EXPLANATION about the hose to faucet vacuum breaker! Thank You!!

[dogatonic]

But you CLOSED the spigot valve. How is water going to go back in if the valve is now closed?

[ENCXBG]

The only way water can backflow back into your house is if the water pressure dropped coming from your house and the pressure beyond the spigot was higher than the pressure coming from the house. This is why water shoots back through the valve when you close the valve. The second the pressure at the valve is lower than the pressure built up inside your hose the water switches direction. This is why you won't get the water pressure release if your hose is wide open when closing the valve. Seems useless on a hose bib. Good idea for irrigation systems that could potentially get contamination in the irrigation lines.

[conisims]

I just got one of those soft expanding water hoses and every time I turn off the water I get that bubble action. I kept trying to fix! I was so frustrated. I’m so glad I saw this on your video! Now I can relax and just water! lol Thank you!

[keithtrap]

Once you turn off your hose bib valve there is no backflow. A backflow only occurs when you've left the hose on and you may have a sprayer attached that is turned off and when you turn on water in the house then the water can enter through the hose bib water line and contaminate your water. This occurs due to a siphon effect. That's the only way a backflow system will prevent the house water from being contaminated.

[ikeo]

how does the water get into the house if the tap is off?

[averageguy]

They should have made it easier to replace. That break away set screw is horrible.

[moelo]

I’ll be setting up the same type of irrigation system and was worried about the back flow when shutting off the water, thanks for such a simple explanation.

[droz]

Just removed both left from previous owner and which were rusted and prevented me from removing hose left on property AND ability to correct bad spray from hose... I demolished both in order to just have access to replacing old hose and resolve bad spraying.... And, thanks to THIS video, now I know I have to replace both with new valves.