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Filter Socks

For the 4" socks - what size hole do I need drilled in my sump to make a holder for these?

Filter Socks

For the 4" socks - what size hole do I need drilled in my sump to make a holder for these?

Last updated on 03 Nov, 2025

A 3 3/4 inch hole will allow the ring of the filter sock to fit flush on the glass.

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