This is a 30" long replacement for the grids used by various companies. These are used in filters which use one of these partial grids and 7 full grids which are the same height but 11-1/2" wide.
This is used in filters which have a total of 60 square feet of filter area.
This is distinguishable by the double slot on the ends of the tube.
The Filbur equivalent is number FC-9450 and the Pleatco is PSC-5P.
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