These pipes are made as per IS 15328 standard and are marked with ISI mark. The pipes are available in different stiffness classes as given in the table below. The pipes are plain ended and are available in 3m and 6m lengths. Separate coupler with unique design of click ring and rubber-sealing rings are available up to 250 mm sizes which makes the system absolutely watertight. In case of 315 mm and 400 mm solvent weld type coupler is provided.