Nu-drain pipes are made as per IS 15328 and marked with ISI mark. These pipes are available in different stiffness classes as given in the table below. Pipes up to 250mm sizes are available with plain and socketed ends. Pipes supplied with socket ends are available both in solvent weld and rubber ring. 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. 315 and 400mm size pipes are supplied only with plain end and solvent weld type coupler. The pipes are available in 3m and 6m lengths