Straight pipe in a variety of lengths. Used to construct biomass pellet pipe systems, these pipes are manufactured from galvanised steel and have a 1mm wall thickness. Each end of the straight pipe is turned through 90 degrees to form a flange. When two sections of straight pipe or a straight pipe and an elbow are to be joined, a rubber seal is fitted to one flange, the flanges are butted against one another and a clamp is placed around the diameter and screwed tight.