HS Codes for Pipes, Valves, Fittings, Piping When we export goods and make a customs clearance, we need to declare the HS Codes of the goods. WHAT ARE HS CODES? What is its function? What is the main HS CODE for our main business of Pipes, Valves, Fittings, Piping? Today, we will answer. https://www.investmentcastingpci.com/blog/hs-codes-for-pipes-valves-fittings-piping/