39173210000 under HS Code TUBES, PIPES AND HOSES, AND FITTINGS THEREFOR (FOR EXAMPLE, JOINTS, ELBOWS, FLANGES), OF PLASTICS - OTHER TUBES, PIPES AND HOSES: OTHER, NOT REINFORCED OR OTHERWISE COMBINED WITH OTHER MATERIALS, WITHOUT FITTINGS:OF CONDENSATION OR REARRANGEMENT POLYMERIZATION PRODUCTS, WHETHER OR NOT CHEMICALLY MODIFIED, 05040000000 under HS Code Others, and 39171090000 under HS Code Others were the top imported HS Codes by FIRST PHIL PACIFIC CASING INC in 2021.