Shanghai Flywheel Copper Tube or Qingdao Hongtai Copper Tube, which copper tube is better?
Qingdao Hongtai is good, Daikin uses Hongtai tubes, and major projects such as Bird's Nest, Shanghai World Expo Pavilion, Qingdao Shangri-La Hotel, Qingdao wanda plaza, Shijiazhuang wanda plaza, University of De La Salle in the Philippines, Marriott International Hotel in the Philippines and Ping An International Financial Center all use Qingdao Hongtai copper tubes.