I designed this to work with the Royal Manufacturing 30 inch sluice box. Instead of having to find a spot in your creek or river you can use this to enable a recirculating pump. I would recommend a 1200 gph pump for this. The fitting is for SAE 3/4 inch I.D. hose. Once you print the 2 halves I would recomend E6000 glue to hold it together.
Print as oriented. You will need supports for the water inlet half.
The author hasn't provided the model origin yet.