... 3/4" Material: according to the customer's requireme Insulated copper tubes are widely applied in the vehicle, ships, buildings, chemical ... ASTM B-280, EN-12735, JISH-3300, GB/T-17791(copper tube) Insulated Material: PE Character: Anti-UV, good heat resistance ... , low water absorption Copper thickness compatible any gases: R22 - R407C- R410A -R404A - R507C ...