A San Diego Plumber Comments on Back flow preventers and that they actually appear in many circumstances around the home and around businesses.
Question Posted on the Quora platform.
A Backflow preventer. Installed on your sewer MAIN DRAIN LINE.
Usually for instance like in the front yard on the SEWER MAIN before it goes out to the street. This Will stop anything from coming back into the house.
Basically it has a flapper inside, looks like a coupling with a flapper inside. Which in some cases certain houses get flooded out often. And this prevents this from occurring.
The work should be done by a professional. This San Diego Plumber Recommends. Backflow preventer should be done by a licensed person.
There are actually several types of water backflow preventers that can be used on a house for instance a backflow preventer on a hose bibb. (Or where you connect the water hose outside in the yard.)
So nothing goes back into the House and does not contaminate the Water Supply. Or Backflow preventers on your irrigation…
When you see out in the yard PVC piping or sticking out of the ground with valves. Those are backflow preventers.
They will usually be a minimum of 12" inches above the ground. This is for the PREVENTION, of Contamination of the Potable water source.
Consequently you have many situations that this is applicable to, like water backflow prevention device’s in the public venue. etc...
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