84139120 under HS Code PUMPS FOR LIQUIDS, WHETHER OR NOT FITTED WITH A MEASURING DEVICE; LIQUID ELEVATORS - PARTS: 8413 91 - OF PUMPS: OF CENTRIFUGAL PUMPS, 84137091 under HS Code PUMPS FOR LIQUIDS, WHETHER OR NOT FITTED WITH A MEASURING DEVICE; LIQUID ELEVATORS - OTHER CENTRIFUGAL PUMPS: OTHER: SINGLE AND MULTISTAGE CHEMICAL PROCESS PUMPS, and 84818090 under HS Code TAPS, COCKS, VALVES AND SIMILAR APPLIANCES FOR PIPES, BOILER SHELLS, TANKS, VATS OR THE LIKE, INCLUDING PRESSURE-REDUCING VALVES AND THERMOSTATICALLY CONTROLLED VALVES - OTHER APPLIANCES: OTHER. were the top exported HS Codes by MARC FLOW ENGINEERS in 2021.