How about the after-sales service of South Whale Dolphin Intelligent Leak-proof Valve?

Very good! In addition, the South Whale Dolphin Intelligent Leak-proof Valve has obtained three national invention patents and eight utility model patents. After four years of practical application, the efficiency 100% and the accident rate are zero. Therefore, it was highly recognized by the contractor, China Ping An Insurance Company, and the upper limit of single payment was raised to 200,000 yuan.