[…] Vacuum Breakers – aka backflow preventers.  This is a device that can be purchased at most hardware stores, and should be screwed on to the end of any exterior sillcocks, or indoor faucets that could accept a garden hose thread (typically the laundry faucet).   These are basically one-way valves that protect the city’s water supply from potential contamination.  Note the set screw in the vacuum breaker pictured to the right – this set screw should be tightened down until broken off to make sure the vacuum breaker is permanently installed. […]

Thanks for the great info. I found your site while trying to figure out what that brass thingy was on our outdoor faucet. Your explanation is fantastic.

However, I did witness toilet tank water get siphoned into the drinking water of a home I was inspecting once. The water in the tank was black, and a big slug of that water came out of the tub spout as I was filling the bath tub. It happened right went I flushed the toilet.

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Thank you for explaining why the city of warren,MI has a requirement for installing vacuum breakers on sillcocks and laundry tubs. I believe it would require a completely stupid, thoughtless person to actually contaminate their potable water the way you’ve described it (something I’m willing to bet one of the five totally incompetent building inspectors has managed to do) but as improbable as the set of circumstances are that would lead to this you’ve made it make sense to someone with a good understanding of plumbing systems who keept wondering why you would need a vacuum breaker attached to something that closes completely with a valve and has water pressure pushing against it.

If you’re selling a house in Minneapolis, get some vacuum breakers. When you have a place for a garden hose to connect to the municipal water supply, you need some type of backflow prevention, and that’s what these devices are for. This is one of the required repair items for the Minneapolis Truth-in-Housing evaluation, which is a required inspection for anyone listing a home for sale in Minneapolis.

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This form must be completed and signed prior to us conducting any moisture testing. We cannot perform the moisture testing requested by the buyers without this form being signed.

We will make every effort to use a caulk that closely matches the color of the surrounding siding; however in some cases the holes may be noticeable upon close inspection. If the holes are of any cosmetic concern the property owner can have them painted with a matching paint.

In order to perform this inspection, we need the permission of the owner. We should have access to all parts of the exterior. Any security systems will need to be shut off during the testing, which can take several hours. We use standard industry practices for conducting the moisture tests, which includes the use of a penetrating probe meter to verify the moisture content of the structural wood and sheathing of the building. 3/16” holes will be placed under most windows and other possible moisture entry areas. These holes will be filled with caulk when the testing is completed.

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If you have a laundry faucet without garden hose threads, you don’t need one of these devices. And you also don’t need them at the water supply connections for your washing machine.

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Low temperature valves are crucial components in many industrial processes that involve extreme cold conditions. To ensure their reliable operation, a low-temperature test is performed on these valves. This test involves exposing the valve to temperatures below its rated minimum operating temperature and checking for any leakage or damage. The test helps to verify the valve's ability to withstand low temperatures without compromising its performance.

Where can I find a vacuum breaker? Vacuum breakers are sold at hardware stores and big box home improvement stores. You’ll typically find them near the outside faucets. The cheap one pictured at the beginning of this post doesn’t technically meet current plumbing code requirements because it’s not field-testable, but Minneapolis will let them slide.

During the test, the valve is typically placed in a chamber where the temperature is gradually decreased to the desired level. The valve is then tested for any leaks or damage, and if it passes, it is certified for low-temperature operation.

How could your water get contaminated? Picture this scenario: I want to mix up some vegetation killer, so I buy the concentrated stuff, pour it into a garden sprayer, then put my garden hose in the bucket to fill it. I turn the water on, but I get sidetracked with a plumbing project.  I shut off the water to my house, and then open up the laundry faucet to drain the water out of the pipes. This will create a siphoning effect, which could actually suck the nasty chemicals in the garden sprayer back into my home, contaminating the potable water. An even worse scenario would be the city doing work on the water pipes, and the chemical gets siphoned back into the city’s water supply, contaminating a whole neighborhood.

Structure Tech specializes in the moisture testing of buildings for the purpose of determining if there is moisture located behind the exterior wall cladding. A moisture inspection of your property has been requested.

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The two most common places where these are installed are at outside faucets and at laundry sink faucets with garden hose threads. An external vacuum breaker is required at outside faucets if they don’t already have one built in. How do you know the difference? Look for the number “1019” or “1011” somewhere on your faucet. If it has that, you don’t need an external vacuum breaker. Check out the examples below; none of these faucets need an external vacuum breaker.

So why do I need this thing? A vacuum breaker, commonly referred to as a backflow preventer, is a device that prevents the potable water in your home, and possibly your neighborhood, from getting contaminated. It’s basically a one-way valve.

I know they have to be called out in an inspection, but I have never actually heard of a scenario where something bad happened to somebody’s house because of the lack of a VB.

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The high-temperature butterfly valves are industrial valves designed to regulate or control the flow of high-temperature fluids or gases. These valves can withstand extreme temperatures of up to 1200°F (648°C), making them ideal for use in applications where high temperatures and pressure conditions exist.

Hi Alex, no first-hand knowledge of this particular type of backflow, but on the other hand, I don’t have first-hand about a lot of the safety issues we call out as home inspectors.

Advance make Balancing Valves provide a full complement (size ranges, pressure ratings, operating temperatures, and fluid characteristics) including related services such as on-site commissioning for optimum performance. Available in PN 16 / PN 20 or Higher (on request).

While these scenarios aren’t likely, it has happened many times throughout the country, and the cost of fixing a contaminated water supply for a city is huge. The cost of a vacuum breaker is very little, about eight dollars. While Minneapolis enforces this plumbing code requirement at the time of sale, this isn’t a special requirement for Minneapolis. Vacuum breakers are still required by national plumbing codes all over the country, and they’re required throughout Minnesota by the Minnesota State Plumbing Code, section 4715.2100 (D).

The design of the high-temperature butterfly valves typically features materials that can withstand high temperatures, such as graphite, metal alloys, and ceramics. These materials allow the valves to operate effectively and safely under extreme conditions, minimizing the risk of damage or failure. These high temperature valves are essential components in industries such as power generation, petrochemicals, and refining.

To suit the channel requirements, there are high temperature valves and low temperature valves capabilities in the same valve itself. In other words, these balancing valves can withstand extreme temperatures without spillage or breakdowns.