We are offering pu tube. Antiwear protection for suction and delivery pipe, heavy, smooth interior, can discharge static. High pressure and vacuum resistance, optimal flow property and good anti-chemical properties. Qualified flame retardance meets the ul94-2v standards.bend radius equals to external diameter. Pipe wall materials: special ether-polyurethane (pre-pur) (pre-pur see chapt 0.3)temperature range: about -40 to +90 .