... Temperature and Pressure Key Specifications/Special Features:Aluminum composite pipe Material: PPR, aluminmum With five layers, inside ... PP-R material 100% oxygen tightness, very suitable for heating systems Improved resistant to impulse under low temperature ... products include PEX-AL-PEX,PPR,PPR-AL-PPR,PEX,PERT,PE,...piping and fittings.Value: Quality, Trust ,Stable. PPR-AL-PPR pipe