Clark-Drain 600 x 600mm clear opening galvanised steel recessed manhole cover with polypropylene frame and 5T GPW load rating classification. Internal sealed manhole cover to prevent odours. Galvanised to BS EN1461. Sealed and locked. Includes frame. Recessed for concrete/screed infill. The T16G3 is a 600mm square, recessed manhole cover with a fully galvanised tray and a polypropylene frame. Ideal for internal use, this cover features a factory fitted rubber sealing gasket to prevent any drain odours from escaping from the drainage system. It can also be used externally in pedestrian areas, but this cover is not suitable for driveway use. The internal recessed tray depth is 43mm, ideal for concrete or screed infills. Like all manhole covers, the size refers to the clear opening size, in this case 600mm x 600mm. The actual overall size of the cover and frame is 740mm x 740mm x 58mm. There is a moulded grouting flange for easy installation. This cover, which is made by Clark-Drain, has a 5 Tonne load rating.