Mufa PEHD Rainplus 56 PEHD Rainplus 56 is a polyethylene (PE) pipe that is designed for use in both above-ground and underground applications. This pipe is manufactured using high density polyethylene (HDPE) and is designed to withstand extreme weather conditions. The pipe is corrosion-resistant and has a smooth inner wall to reduce friction, providing efficient water flow. The pipe is designed to be resistant to UV radiation and is available in several different diameters and lengths. This pipe is suitable for use in drainage, water supply and irrigation projects.