The Deepflow semi-elliptical profile produces self-cleansing flow resulting in a very high capacity. Deepflow can be installed using a notched or notchless joint. Please note that due to the manufacturing process of this product, the colour may vary slightly from one batch to another. The RAL colour codes referred to in this description should only be used by customers as a guide to the closest colour match on the RAL colour palette and should not be regarded as a definitive colour match. Specifications Size: 110mm x 75mm Length: 4000mm Colour: Anthracite Grey (Closest RAL Match - RAL 7016)