We manufacturing non pressure pipes in various diameter types and class Np2,Np3 and Np4 are mainly used for light, medium and heavy duty lines.Np2 class used for drainage and irrigation for cross drain / culverts carrying light traffic. Np3 class are mainly used for drainage, irrigation, railways, roads & runways for making culverts, drains and carrying medium traffic.Np4 Class used for carrying heavy traffic raning from 80mm to 2600mm.