We supply R&B JT UK Ltd.’s extensive range of Ductile Iron D400 manhole frames and covers suitable for Group 4 Class D400 carriageway environments that are subject to fast-moving traffic.

These products include square and rectangular designs with either slide out or pull-out triangular covers, in both 100mm or 150mm deep frames and a variety of clear opening dimensions. Circular covers with both circular or square frames are also available for wastewater applications. 

To complement this range, we also supply ductile iron gullies and grating covers together with surface boxes for D400 carriage road applications.