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plural downpipes
The drainpipe that connects a roof-line gutter with the ground. quotations examples
NR plans to install new aluminium downpipes to carry the considerable rainwater for which the area is known.
2020 May 20, Philip Haigh, “Ribblehead: at the heart of the S&C's survival and its revival: Ribblehead Viaduct repairs”, in Rail, page 26