Approved for hot and cold water applications. The most freeze resistant pex plumbing available. Replace galvanized, copper or CPVC water lines without soldering or glues or tools. Recommended for potable water systems. Purchase in coils, straight lengths or individual pieces. Marked with red and blue ink to allow easy identification of hot and cold water lines. If using pipe outdoors it must be buried or sleeved to protect against UV rays for long term usage.