Meltex double drainage pipes for drying foundations of buildings and land and field areas. SN4 strength class pipes are suitable for lighter loads, such as fields, private road connections, and yard and green areas. Double drainage pipes are perforated either around or on the top and are double-layered, with a corrugated outer surface and a smooth inner surface. Meltex manufactures double drainage pipes according to the SFS 3453 standard, and they meet the quality requirements of RIL 128-2002. Double drainage pipes are made from durable polyethylene, and their length is 6m.