These are designed to be used with the Blichmann BoilerMaker Brew Kettles for use in a mash tun. Will also work great if you're using whole hops in your boil kettle (for pellet hops, we recommend using the Blichmann HopBlocker). A patent pending button louver design is a hybrid of a perforated false bottom and a slotted manifold to give you the best of BOTH designs!,Please Note: This False Bottom is for the BoilerMaker™ G1 15 gal Brew Pot by Blichmann Engineering™ and will not function with the G2 model. . For a 15 gal G2 BoilerMaker False Bottom, see BL385.