A plumbing system for Polybutylene Pipe and Pex designed for normal hot and cold potable water applications. Extremely simple to install. Crimping tools, solvent cement, torches, solder, or Teflon tape are not needed.Fittings are reusableNo corrosion or scalingHigh resistance to cold temperatureComplies with ASTM D3300 standard. NSF listed (Standard 14)