Can anyone identify this??? The house was built in the late 50's and is in So. Cal. It is located on the 3/4" branch for my water heater...(after passing by a hose bib). It just comes down and "u" turns back up again. The black segments are rubber. The red rings are some sort of cardboard, don't know why they are there.
Is it anti-siphon?
I'd appreciate any help.