The PP-Ribwall IT sewer pipe is an infiltration pipe with a double-walled structured wall (Type B). PP-Ribwall pipes have a nominal size (DN) that refers to the internal diameter. The PP-Ribwall IT sewer pipe complies with BENOR NBN T42-115, strength class SN16, and is equipped with a socket and a pre-assembled sealing ring. The inner wall of the PP-Ribwall IT pipe is smooth and white in colour, while the outer wall is black. Material: SBR sealing ring. The PP-Ribwall IT sewer pipe can be supplied with a wrap of BENOR-certified geotextile HF180.