I am in a newly rented house around 1 week and I don't know a thing about plumbing (not yet and I love projects for DIY).
So my question is regarding this: I find this attached to the outdoor pipe where I connect my hose. I bought a water gun hose attachment; when I connect it to the pipe and "turn it on", water starts to come from the small holes on the vacuum breaker. Is it normal? Or do I have to fix it myself or contact my landlord!