If reventing is complicated and wet venting isn't allowed, installing a loop vent is an ideal alternative. An example would ...

An island sink presents a unique plumbing problem ... s overflow level before it goes horizontal. Obviously, a vent pipe in a kitchen island can’t do that. One solution to this quandary is ...

You don’t need a brand-new sink to add this practical, foolproof tool to your kitchen — just get out the measuring tape and order yours, starting at under $20 at Amazon.