Red is for use with hot water supply, blue is used for cold water supply to make identification easier, white can be used for both or to identify water softners or incoming water line. Flexible, corrosion-resistant hot/cold potable water, CTS (rigid copper tube size) for use with Quick connect push-on fittings and/or, brass and poly alloy PEX insert barb fittings. Barbed insert PEX fittings are secured using either stainless steel cinch clamps or copper crimp ring methods. Support pipe every 30" vertically and 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". 25 year warranty even when used with other manufacturers ASTM SDR-9 Certified fittings, covers materials, labor and is not pro-rated. Maximum working pressure: 160 psi (pounds per square inch) (11 bar) at 73.4 F (degree Fahrenheit) (23 C degree Celsius); 100 psi (6.9 bar) at 180 F (80 C); 80 psi (5.5 bar) at 200 F (93 C). PEX tubing cannot be solvent welded. Caution-Do not use any pipe dope or thread sealing compound or duct tape as damage to pipe or fittings can result.