... /HCFC free,dust free & fiber free,ideal for green buildingRubber Insulation Tube's sepecification: wall thickness (normal)in(mm)1/4",3 ... (m)6',6.82'(1.83,2)About the Thermal Insulation Tube inner size ≥89mm, we suggest use the same thickness of ... information ,please feel free to contact us NBR/PVC black rubber foam insulation pipe for refrigeration,solar,and air conditioner