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304 Stainless Steel Basket Beer Keg Dry Hop Filter.  300 micron mesh

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From the product description, check product page for current description, price and availability:

100% 304 Stainless Steel,300 micron mesh;Allows hop oils to flow into your beer but keeps the hop material inside;Easy removal,great for Dry Hopping in Kegs;It will hold up to 2 ounces of leaf, even more pellet,also can be used in your boil pot;For use in cornelius kegd to dry in 5 gallon kegs

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300 Micron Mesh Stainless Steel Dry Hopper for Cornelius Kegs Corny Keg Homebrewing,70mmx300mm