used CPR c-siphon overflow for sale. *S O L D*
 

C-Siphon Overflow (CS-50)
-Adjustable water level allows easy changes of in tank level.
- Black top reduces algae growth.
- Plastic screen to prevent fish loss.
- Quiet operation.
Specifications:
- Flowrate: 300GPH
- Bulkhead Size: 3/4"
- Width: 6-1/2"

$75 obo
comes with small powerhead and tubing to prevent air from getting trapped in overflow.
and a couple of PVC fittings.