Safety covers / Manhole covers

When we face with heavy rain for a long time, manhole covers flood discharge rate not reach to the demand, then we need professionals to open the manhole cover and guard. Falling into the sewer threat exists because of the bad weather and poor visibility. Screw covers not only flood spillway efficiently, but also to provide protection for wakers on the load. In order to ensure safety, safety covers was upward spiral, integrated installation. This design will prevent wakers falling into sewer.