... :16,20,25,32 3.ISO9001,CE 4.OEM PE-AL-PE gas pipe1.material:pe,al2.size:16,20,25 ... density of PP-R pipes is 0.89-0.9g/cm, only 1/8 of the steel pipes, 1/10 of ... inside walls and concealed foor construction.11. Complete accessories PE-AL-PE Pipe for gas