Made Of The Finest Cross-Linked Polyethylene (Pex). Flexibility That Allows Fast Installation, Bends Easily Around Corners. Withstands Freezing, Gets Stronger As The Temperature Gets Colder. Tubing Has Been Tested To Withstand Freezing Down To -95 Deg. F. Winterizes Easily - Can Be Used With Most Anti-Freeze Solutions. Repairs Easily, Should Ever A Frozen Tube Need Thawing, Simply Apply Heat, Using A Heat Gun, The Flexible Tubing Will Not Weaken From The Applied Heat. Type A Pex. Maximum Working Pressure: 160 Psi (Pounds Per Square Inch At 73.4 F (Degree Fahrenheit), 100 Psi At 180 F, 80 Psi At 200 F.