Mufa PEHD Rainplus 90 Rainplus 90 PEHD is a high-density polyethylene (HDPE) pipe manufactured by the Rainplus Company. It is designed to meet the needs of a variety of applications, including drainage systems, water pipes, and industrial and agricultural applications. This pipe is designed to be resistant to corrosion and abrasion, and is highly durable. The pipe is also designed to be flexible and easy to install. Rainplus 90 PEHD is available in a range of sizes and can be used for various applications.