Eagle Brewing AG405 Stainless Steel False Bottom by Eagle.  12″ diameter.  Designed for 10 gallon beverage containers.  Stainless construction.  3/32 perforated holes on 5/32 centers.  3/8″ barb fitting.

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Eagle Brewing AG405 Stainless Steel False Bottom, 12″ Diameter

Also: 12″ Stainless False bottom at MoreBeer | Igloo 10 Gallon Cooler

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