Automatic backflow pipe closure device for manholes or drains, includes float for keeping check valve above water level

摘要

The closure device comprises a closure part (A) with a check valve (1), a control part (B) with a float (2) and a rod (C). The device can be installed directly inside the manhole in the drain or sewer, either open or enclosed inside a casing, and either with or without drain or sewer pipe connections. The float is designed to keep the check valve above the water level.