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This Keene hopper can turn about any 10 inch wide sluice into a power sluice, hibanker, or 2 inch dredge. Made of black Marlex plastic the hopper features an adjustable classifier, spray bar, with built in adjustable water flow and pressure port controls. Specifically designed for the Keene A-51 or A-52 sluice and requires the Sluice Extention to be used with an A-52 Sluice Box.