If it's just the return from your sump it shouldn't really have that much pressure. On my rebie return the my overflow I just have the fittings pushed together with no glue, the drip a little bit and get salt creep but have not had any major issues with not using glue.
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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