39174000 under HS Code TUBES, PIPES AND HOSES, AND FITTINGS THEREFOR (FOR EXAMPLE, JOINTS, ELBOWS, FLANGES), OF PLASTICS - FITTINGS, 73071900 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - CAST FITTINGS : OTHER, and 73079390 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - OTHER : BUTT WELDING FITTINGS : OTHER. were the top exported HS Codes by D&C VIETNAM INVESTMENT TRADING JOINT STOCK COMPANY in 2021.