siphon trap

siphon trap

In plumbing, a trap, 1 shaped like the letter S on its side, in a vertical plane; the lower bend contains the water seal.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
It's a lot less expensive than having a licensed plumber change the siphon trap to a P-trap, but your local code may require the upgrading when you are ready to sell your house and a competent inspector finds the problem and has to report it.
Another possibility is a siphon trap under the sink -- the trap which you found incorrectly installed.