... got the CE certificate and pass the Rohs test! 1,Copper tube:O.D.1/4''&3/8'',1/4''&1/2 ... '',1/4''&5/8'',3/8''&5/8'',3/8''&3/4'',1/2''&3/4''2,Copper tube:thickness from 0 ... B280,JIS H3300 C1220T,EN12735-1, AS 15715,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc.6 ... water absorption9,Insulation pipe can be printed with letter. Insulated copper pipe(tube)