The CLKS450SR/46SL is a square, recessed sealed and locking manhole cover that connects directly onto a 450mm inspection chamber. The internal recessed tray depth is 43.5mm.Like all manhole covers, the size refers to the clear opening size in this case 450mm.The actual overall size of the cover and frame is 580mm x 580mm x 54mm. The overall depth including the connection ring to the chamber is 153mm. As the outlet connection is circular the cover itself can be rotated to match up with the paving pattern.Ideal for internal use, this cover features a factory fitted rubber sealing gasket to prevent any drain odours from escaping from the drainage system. This cover can also be used externally in pedestrian areas for driveway applications we recommend the use of our CLKS450SR manhole cover.This manhole cover has a 5 Tonne load rating.This cover, which comes with integral lifting handles, is made by Clark-Drain.