Manufactured by JFC from high density polyethylene. The twin extrusion process, by which two layers are extruded simultaneously, gives the pipe a corrugated outer wall (for strength and durability) and a smooth inner wall (for increased flow capacity). Resistant to naturally occurring chemicals, this pipe can easily be cut on site and installed at depths from 0.5 to 10 metres. A lightweight yet strong pipe, perfect for culverts. Available in sizes from 94mm to 600mm. Full range of fittings also available. BBA, HAPAS Roads & Bridges Agreement Cert No 02/H069.