DRAIN BACKFLOW COUNTERMEASURE DEVICE, AND ROOF DRAIN WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a drain backflow countermeasure device which allows countermeasures for backflow when a new roof drain is provided subsequently with an existing roof drain remained, and a roof drain with the drain backflow countermeasure device.;SOLUTION: A drain backflow countermeasure device 4 is provided in a waste water pipe 10 connected to a roof drain 9, and has a tubular body 5 formed like a tube, and a closing member 6 which is provided along an outer circumference of the tubular body 5 so that it can be expanded and contracted in a radial direction of the tubular body 5, and closes a gap between itself and the waste water pipe 10.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT