REHAU has updated its INSULPEX® energy transfer pipe to include 16 new ASTM-compliant inch sizes that meet North American standards, as well as more than 50 new EVERLOC® fittings. Engineered for the efficient transfer of hot or chilled water, INSULPEX consists of pre-insulated RAUPEX® pipe for a flexible, lighter alternative to rigid piping systems. The smooth interior wall of RAUPEX carrier pipe provides high-quality flow while eliminating corrosion. Available in one- and two-pipe configurations, INSULPEX pipe is produced with a bonded layer of CFC-free polyurethane foam insulation that minimizes heat loss and water permeability, yet is still flexible. The outer casing of seamless, co-extruded polyethylene is now black for increased UV resistance. REHAU. Circle 11.