Van Walraven supplies a wide range of leading brand PVC pipes and fittings for indoor and outdoor drainage and sewer systems. As a user of Van Walraven materials you can count on us when it comes to drawing up piping plans, making capacity calculations, considering material properties, etc. The elements of the PVC indoor drainage system are solvent welded. The various adhesives, with the product information, can be found in the adhesives and sealants section of our catalogue. You will see the terms SN 4 and SN 8 with these pipes, previously these were class 41 and class 34. These codes indicate the stiffness class of the pipes, the ratio of the diameter and wall thickness. In certain situations, a stiffness class SN 8 is prescribed, while in other situations SN 4 is sufficient. The Van Walraven experts are happy to advise you. PVC pipes are recommended in the Dutch National Sustainable Building package because PVC can be recycled. You can return used PVC to Van Walraven for recycling. Wavin ultra - 3 tube has the Recycore® Technology mark and the KOMO quality mark.