Find the lowest price for:       All ProductsOverflow Boxes     0.0 (0)   Add a review Continuous Siphon Overflow - CS50 - 3/4 in. bulkhead - 300 gph   Continuous Siphon Overflow 3/4" Single Bulkhead, 300 gph by CPR Aquatic. Continuous Siphon Overflow: These pre-filters are the best way to move water from an aquarium to a filtration system without expensive modifications Have a question? Ask the Experts! Compare Prices Product Spec Member Reviews Recommend to Friends Edit the spec Category Other Something wrong in this page? Let us know! Related products: More Other Overflow Boxes Other Overflow Boxes internal use: spec484