It features by anti condensation, easy installation and beautiful appearance. Insulation tub is 3 layers close cell cross-linked  30 times PE foam. Inner layer is 120˚C resistant seamless extrusion tube. It has better anti condensation charactor due to smaller distance between insulation and copper tube. Outside embossed anti UV film could protect surface from scratching, deforming and aging so as to ensure its life time to over 8 years.  Copper tube is annealed treatment (20m,30m,50m) to increase it softness and easiness on bending. It saves lots of installation time