The Reef Diaper replaces standard 4” filter socks. The seal is designed to fit a 3-3/4” diameter bore. This is the standard size for most sumps that use 4” filter socks.
The seal may not be required if the tank overflow hose feeds directly into the sock. In this case the Reef Diaper will fit smaller diameter holders and the flange assembly can simply sit on top of the holder.
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