The Clark Drain CD456 is a circular solid top cover in a square frame manufactured from black polypropylene. This drain cover should be used on domestic driveways and has a loading of 3.5 tonnes (35Kn). The drain cover has dual locking as the cover screws into the frame and the frame screws into the chamber top. The cover can be roted to suit the pattern of the syrface finish and can be adjusted up to 15 degrees of tilt to accomodate any uneven ground.