API Stainless Steel Pipe Fitting 1.Grade:J55,K55,N80, ... : API 4.Place of Origin: China API Stainless Steel Pipe Fitting---------------------------------------------------------------------------------------------------------------------------------------FeaturesGRADE: J55, K55, N80-1, N80-Q ... in April 2011. (Formerly known as YingKou OuYang Steel Tube Co., Ltd.)YingKou OuYang Metal Manufacturing Co., ...