Water system components

[Walter Pigeon]

I am in the process of replacing vessel sink and relocating faucet in bathroom and I came across this component... Does anyone know what it is or what it's function is ?

[NO3putt]

It is a vacuum break. You might find more under other sinks.

[bubbles]

No you wont find more unless you have more than one black tank cleanout because that is what it is for, It is a vacuum breaker but also a backflow preventer. You should have a black tank cleanout port on the outside of the unit.

[bubbles]

Here ya go:

[NO3putt]

We have 3, both bathroom sinks and one under kitchen sink. Skip

[cavie]

Originally Posted by Walter Pigeon

I am in the process of replacing vessel sink and relocating faucet in bathroom and I came across this component... Does anyone know what it is or what it's function is ?Attachment 161052

It allows your sink to drain without the use of a vent stack thru your roof.

[CedarCreekWoody]

As stated, it is a vacuum break. It's purpose is to prevent the garden hose attached to the tank flush from sucking the contents from the black tank if it should suddenly have negative pressure which can happen if you lose water pressure.

[Walter Pigeon]

Woody, a vacuum break to prevent siphoning is what I thought it was and there is a Studder vent at the top of the drain pipe along side (the black ABS)

[Walter Pigeon]

Thanx to everyone that offered an answer. This is a great source of info !!

[5picker]

Just for clarification... were you asking in the original post about the device connected to the blue plumbing lines or something different because you've received some conflicting advice. (and confusing advice for those reading along that don't know the difference)

[cavie]

Originally Posted by cavie

It allows your sink to drain without the use of a vent stack thru your roof.

sorry, I was referring to the black pipe valve. Many people have never seen one.

[Walter Pigeon]

I was able to sus out the respondents postings... like with most issues addressed here, you have to assess the totality of information proffered !!

[jeff64]

That is a vacuum break, specifically a Valterra vac break. I replaced the black one in my black tank flush because it leaked and are notorious for that. This clear valterra mtg. break has worked fine for the past two seasons FWIW