down pipe 头批 ; 落水管 ; 雨水管
vertical down pipe 垂直距离
blow-down pipe 放空管
run-down pipe 溢流管
storm down pipe 暴雨水落管
wash-down pipe 冲洗管
boiler water blow-down pipe 锅炉排污管
Exhaust Down Pipe 排气下管
N a pipe for carrying rainwater from a roof gutter to the ground or to a drain 落水管 (Also called rainwater pipe, drainpipeUsual US and Canadian name downspout) [英国英语]
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