73079390 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - OTHER : BUTT WELDING FITTINGS : OTHER, 73043990 under HS Code Others, and 73079190 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - OTHER : FLANGES : OTHER. were the top exported HS Codes by Red Sun Technology and Services Trading Company Limited in 2021.