Whether deciding how to build your own dredge or highbanker/dredge combo, or just refurbishing an old system, the compatibility information below is helpful. (These general recommendations are for standard hungarian riffle sluice boxes.)
1.5 inch, 2 inch, and occasionally 2.5 inch dredge nozzle: 10 inch wide sluice box
2.5 inch dredge nozzle: 10 – 12 inch wide sluice box
3 inch dredge nozzle: 12 – 14 inch wide sluice box
4 inch dredge nozzle: 16 inch wide sluice box
5 inch dredge nozzle: 20 inch wide sluice box
6 inch dredge nozzle: 22 – 24 inch wide sluice box