For the past couple of years now of walking my dog around the neighborhood, I can't help but wonder what is this upside down U-shaped tube thing in everybody's yard. It is wrapped sometimes with what looks like a black garbage bag and some are wrapped with a thick tape. What is this thing?

happybisaya

I used this link, and I got an error message. I used my Kodak Easy Share camera to take the picture, then save the picture in my desktop. At the link you have provided, the conversion settings that I used are: JPEG, resolution is 100, and Quality is 100. It asked for Delivery method: I used the e-mail link, and I still got an error message.

RickJ

I've never used the app at that link, so not sure what the deal is...

Email me the original and I'll put it up for ya!

RickJ

OK, happy, here ya go. Definately gas, not water. I've not seen a setup like that before, and since gas does not freeze, I have no clue why that "insulation" would be on it. I bet someone will recognize it, though!

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happybisaya

Thanks Rick, you should see the ones that is covered with what looks like black garbage bags.

caibuadday

no it is a vacuum breaker back flow preventer........

happybisaya

What does the vacuum breaker back flow preventer do?

RickJ

OK, I see now:
http://www.igin.com/Irrigation/backflow.html

I assume, then, that water does not sit in this thing above ground all year round, is that correct?

fredg

Hi,
Would it be too much trouble just to walk up to a house that has one of these, knock on the door, introduce yourself, and ask what that is for?

caibuadday

yes....if it is properly install...... so no need to worry about freezing and the wrapping.......