Osma 250mm diameter Shallow Inspection Chamber range for use to a maximum invert depth of 0.6m (adoptable and non-adoptable). This chamber features a 250mm diameter base with an integral shaft and a 110mm straight channel with one 110mm x 45° branch entry on each side of the main channel, designed for use with 110mm OsmaDrain components. It is supplied complete with 2 profiled, blank-off plugs for unused side entries. This chamber is compatible with 4D325 and 4D961 covers and frames. Manufactured by Wavin.