Float valve

[The Jewels]

I have been shopping for a top off.

Does this style of hardware work under gravity pressure ?

Does it need municipal pressure to work ?
I imagine if it can hold back a pressured line, then it could hold back atmosphere.

I just dont want to buy something that doesn't fit my application.

 

[pdasterly]

looking for something similar

I have been shopping for a top off.


View attachment 868944
Does this style of hardware work under gravity pressure ?

Does it need municipal pressure to work ?
I imagine if it can hold back a pressured line, then it could hold back atmosphere.

I just dont want to buy something that doesn't fit my application.