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The A51DR is a complete riffle assembly designed to convert a Keene A51 sluice box from a stream sluice into a dredge sluice. The A51DR features Hungarian style dredge riffles down its entire length, and fits easily in a Keene A51sluice box.
It's important to note that higher profile Hungarian style riffles work better in a dredging application than stream riffles, because of the higher water volume and faster flow.