... pipe type CE, ISO9001: 2000 Characteristic: 1. Heat pipe tube: High quality tri-elements coating tube(ALN/ALN-SS/CU), dia. 58mm ... , length: 1.8m/Dia. 47mm, 1500mm, inside is high quality copper pipe-thickness: 1mm2. Inner direct-flow pipe: Red copper ... : <=7%12. Qty. Of heat pipe tube: 10/15/20/25/30PCS Heat pipe High efficiency Solar collector