73071110 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - CAST FITTINGS : OF NON-MALLEABLE CAST IRON : SPONGE IRON CAST FITTINGS, 83071000 under HS Code FLEXIBLE TUBING OF BASE METAL, WITH OR WITHOUT FITTINGS OF IRON OR STEEL, and 84122100 under HS Code OTHER ENGINES AND MOTORS - HYDRAULIC POWER ENGINES AND MOTORS: LINEAR ACTING (CYLINDERS) were the top imported HS Codes by A CHAU PROFESSIONAL MATERIALS CO LTD in 2021.