A device for sealing a passage against the escape of gases, especially a U - shaped or S - shaped bend in a drainpipe that prevents the return flow of sewer gas by means of a water barrier.

• U字形或S字形隔臭管为防止气体漏逸而封堵一段通道的装置，尤指排水管中的U形管或S形弯管，它可以通过水的阻挡防止下水道气体倒流