Lida Steel Pipe. Air-conditioning copper pipe gdly is a product of Lida Steel Pipe. It is produced by Tianjin Lida Steel Pipe Group Co., Ltd. It is one of the top ten brands of metal pipes. It was founded in 1993. It is a famous trademark in Tianjin and a famous brand in Tianjin. It specializes in metal pipes. , development, research and production enterprise of air conditioning copper pipes.