Jeff Handy
Pro Handyman, NOT A Pro Plumber
This is similar to what your island sink drain needs to be changed to look like.
Adding an air admittance valve.
You can install that vertical riser anywhere it can be spliced in.
The AAV should go up as high as possible, to avoid it clogging from grease and crud.
That extension on top with the AAV lets air into the drain as water is flowing down, so it flows more forcefully, and also the trap will not siphon itself dry.
Adding an air admittance valve.
You can install that vertical riser anywhere it can be spliced in.
The AAV should go up as high as possible, to avoid it clogging from grease and crud.
That extension on top with the AAV lets air into the drain as water is flowing down, so it flows more forcefully, and also the trap will not siphon itself dry.