insulation copper tubes for air conditioner Size: 1/4", 3/8", 1/2", ... widely applied in the vehicle, ships, buildings, chemical engineering, air condition, refrigerator, etc.Standard Complied: ASTM B-280, ... good heat resistance, low water absorption Copper thickness compatible any gases: R22 - R407C- R410A -R404A - R507C etc we ... seaworthy strong carton box insulation copper tubes for air conditioner