stainless steel tube fittings 1.Grade:J55,K55,N80, L80,P110 ... STC,LC,BTC 3.Standard: API 4.Place of Origin: China stainless steel tube fittings---------------------------------------------------------------------------------------------------------------------------------------FeaturesGRADE: J55, K55, N80-1, N80-Q, ... get high quality product, best price from our company! stainless steel tube fittings