1, TPCO copper tube: TPCO is a competitive seamless steel tube manufacturer in China, and its air-conditioning copper tube enjoys a high reputation in the world, and it has also been selected by Gree Air Conditioning.

2. Flywheel Copper Tube: Flywheel Copper Tube Co., Ltd. not only produces copper tubes for R4 10A, but also produces air-conditioning copper tubes for R22 refrigeration system.

3. Jiuli Copper Tube: Zhejiang Jiuli Special Materials Co., Ltd. is a high-tech enterprise and a well-known enterprise in Zhejiang Province, specializing in the production of high-quality stainless steel seamless steel tubes.