280mm Diameter Shallow Inspection Chamber Double Seal Square Lid (Pedestrian Loading) Lid Size 300mm x 300mm. Shallow Access Chambers should only be used to depths of 600mm. This is achieved using 1 x Shallow Access Chamber Base (B2800 or B2803), 2 x Shallow Access Chamber Risers (B2801) and 1 x Lid (B2802) Manufacturer: Brett Martin Product Code: B2802