... 3,High air-tightness 4,Anti-corrosion 5,Easy installation Pipe fitting, Connector, Fitting, Coupling, End cap Characteristics1. Chemical Stability Polyethylene ... . Flexibility PE water pipes is convenient to install because curved fittings don't have to be used at bent position and ... 50 years without direct exposure to ultraviolet rays. dn 32mm HDPE Pipe Fitting Socket Fusion 90 Deg. Elbow