Easy installation, resistance to compressive and corrosion forces, light weight and reduction of purchase and installation costs of double-walled polyethylene fittings and durability and long service life of this type of fittings have made this type of fittings welcome in sewerage projects. The variety of double-walled polyethylene connections, the development of the water supply network has accelerated the implementation of sewerage projects and increased the quality of its implementation.

Carogit pipes are produced in different sizes in the form of Carogit pipes and Carogit spiral pipes, which in fact only the production method is different in that in the production of Carogit pipes, polyethylene material is molded and pressed in one piece, but in the production of pipes. Spiral carogit production method is very different. In this method, the profiles or the protrusions on the pipe are cooled by the extruder that produces the pipe profiles after cooling and passing through the water inside the tub, and it is gradually rolled in a spiral and glued together by a series of interactions. After gluing the inner layer of the tube, which is yellow, it sits on the inner wall of the tube and on the profiles and is glued on the tube by defined high pressure pulleys. These pipes are usually produced in high sizes, ie from to . The sizes of corrugated and spiral corrugated pipes are:

Carrogate double-wall pipe or polyethylene pipe Carrogate is the name of a pipe that consists of two layers of polyethylene, the inner layer is completely polished and the outer layer is wavy. Subsurface carries both live and dead loads under the surface of the earth. Carrogate double-walled pipes are classified in various types of pressure parts (pressure means external load pressure), each of which has a specific use depending on the type of soil, surface and subsurface pressure. Carrogate double-walled polyethylene pipes have a high tolerance for soil volume and ring resistance, and the internal pressure of these pipes is usually or times, and these pipes cannot be used in pressurized networks. Coupler and washer or extruder welding are used to connect these Carrogate pipes. Sewage cargo pipe or double-walled polyethylene sewage pipe is one of the products of the factory producing new-style cargo gate pipes, which with its high production capacity and standard quality of Iran and Europe, is currently one of the largest double-walled polyethylene pipe production factories in the west of the country and in Currently, Karogate pipe is exported to neighboring countries and all parts of Iran.

For example, it can be said that mm polyurethane sewage polyethylene pipe has a ring resistance of . kN and double-walled polyethylene corrugated pipe with a size of mm has a ring resistance of , . and kg. Is Newton. It is interesting to know that pipes with dimensions of mm and above have only a ring pressure of . kN and are thus designed only for installation in larger projects.