1/2" Rigid Copper Tube Size x 20', Blue, Pex Stick, For Cold Water, Use With 1/2" Quick Connect & Brass Pex Insert Fittings, W Type B Burst Pex Pipe Rated 1,100 PSI At 73 Degrees Fahrenheit, 375 PSI At 180 Degrees Fahrenheit, Type B Silane Method Pex Has More Anti-Oxidants & Thermal Stabilizers Which Is Critical For Chlorine Ratings & Recirculation Systems, Type A,B,C Are European System Designations Not Rating/Grading System For Pex, Do Not Use Duct Tape, Pipe Dope, Threading Compound, Mineral/Linseed Oil, Support Pipe Every 30" Vertically & Horizontally, Protect Pipe When Entering/Exiting Slab Or Walls, Do Not Kink Or Expose To Sunlight, Minimum Clearance To Water Heaters, Boilers, Wood Burning Appliances 18", Recessed Lights 12", Gas Appliance Vents 6", NSF-61 FDA, CSA/ASTM, UPC Listed/Approved, 25 Year Warranty Even When Used With Other Manufacturers ASTM SDR-9 Certified Fittings, Covers Materials, Labor & Is Not Pro-Rated.