"drain consisting of a U-shaped section of drainpipe that holds liquid and so prevents a return flow of sewer gas"@en-us . . . . . . "104475032"^^ . "0"^^ . . "04475032-n"^^ . "104301780"@en-us . . . . . . . . "trap"@en-us . . "103533619"@en-us . . . "0"^^ . "trap"^^ . . . . .