DRAIN PIPE JOINT

摘要

PROBLEM TO BE SOLVED: To provide the structure of a vertical drain pipe capable of protecting the sealed water in a trap at a lower cost instead of so-called a double tube type of laying down a vent tube to prevent the rupture of the trap. SOLUTION: A projection 12 for forming an area 13 where the flow of drain Wa flowing down along an inside wall is branched to prevent the drain from reaching a part of the inside wall is provided on the inside wall of a drain vertical pipe 1 at a position where the state of communication can be maintained between the inside of the lateral branch drain pipe and the inside of the vertical drain pipe 1 by positioning the opening part 2a of a lateral branch drain pipe in the area 13 where the drain does not flow.