Osma 250mm diameter Shallow Inspection Chamber range for use to a maximum invert depth of 0.6m (adoptable and non-adoptable). Square cover and adjustable frame for use with the 250mm Shallow Inspection Chamber (4D960). For non-trafficked/landscaped locations. Sealed. Can be used internally. For loadings up to 10kN (1 tonne) when supported by a concrete collar. Manufacturer: Wavin.