The hard plastic slip x slip bulkheads with rubber gasket is great for use with wet/dry filters and sump systems in freshwater or marine setups. The Hard plastic bulkheads with rubber gasket are threaded on outside; smooth on inside for slip fitting on both ends.
1/2 inch Bulkhead requires 1.25 inch hole
3/4 inch Bulkhead requires 1.50 inch hole
1 inch Bulkhead requires 1.75 inch hole
1.5 inch Bulkhead requires 2.5 inch hole
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