Designed to provide superior drainage, with a flow rate of up to 6 l/s. Highflo is ideal for large domestic roof sizes and commercial properties. 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: 170mm Length: 4000mm Colour: Grey (Closest RAL Match - RAL 7038)