Manhole flanges, also called solid flanges, are used to seal the ends of pipes. It is usually used at the end of the water supply pipe. There is a temporary part of the pipe section to be tested first and used to temporarily close the manufacturing standard;

Manhole is a flange commonly used in the flange industry, because the appearance is like a lid, so also known as the flange cover, it is installed at one end of the pipe, used to block the pipeline, so that the pipe material is not easy to benefit.

It looks different from the flange, high neck flange other common flange, blind flange hole only in the edge of the bolt, the middle is solid, no pipe hole. (what is blind flange), the sealing surface in a variety of forms, flat, convex, concave and convex surface, tongue and groove surface, ring connection surface, etc., is a common form of blind flange.