... ,K55,N80,P110 3.Place of Origin: China stainless carbon steel Crossover coupling SPECIFICATIONSGrade: J55, K55, N80 1, N80Q, P110Use: ... ., Ltd. in April 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.)YingKou OuYang Metal Manufacturing Co., Ltd. is ... users, please visit our Suggestion CenterComments or suggestions about this page? Tell usShare Your Comments or SuggestionsPlease tell us how ...