Purpose:
The Blue Marlin Filter relieves the hydrostatic and hydrodynamic pressures created by rain water held behind seawalls, revetment, and retaining walls.

3 Sizes:
The 2 in. Diameter filter is supplied in 3 styles.

• 9 inch long for concrete walls, new and retrofit.
• 15 inch long for recovered walls, with backfill gravel between.
• 3 inch long flanged for vinyl new and retrofit sea walls.

All styles of outer drain barrels use the same replaceable filter element.

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