Frame and cover are made of extruded aluminum profile and are easy to open with lifting keys. • At the bottom of the frame, a pre-mounted adapter can be connected to a PVC outlet pipe (diam. 250, 315, 400mm). • Application: indoor and outdoor use. • The cover is screw tight. • Standard equipped with a reinforcement mesh. • The bottom is made of a 3mm galvanized steel plate (on request: bottom plate in 3mm aluminum). • Three seals: double seal at the base and a T rubber seal incorporated into the outer frame’s side. • The T rubber has three functions. • It prevents dirt between the cover and the frame. • The rubber’s elastic effect avoids tension between the cover and the frame. • It offers an additional smell barrier.