... 0MPaPN 2.5MPaOuter Diameterdn(mm)Wall Thicknessen(mm)Wall Thicknessen(mm)Wall Thicknessen(mm)Wall Thicknessen(mm)202.02.32 ... gray or as customer requirement.3.ISO quality system guarantee high quality4.Good resistance to corrosion and ... hot water supply, heating system including flooring heating, wall heating and radiating system, Central air conditioning system, industrial liquids transportation ;Dia20 ...