This false bottom is specifically engineered for use with the Blichmann Boilermaker G1 and G2 Brew Kettles. The button louvers on this false bottom are a hybrid of a perforated screen (which provides high-efficiency) and a slotted Manifold (for plug resistance) which gives you the best performance of both. These false bottoms work with the stepped edge in the Boilermaker Brew Kettles to provide an even seal and virtually eliminate any sidewall shunting. Blichmann recommends the use of whole hops with this false bottom. For hop pellets the HopBlocker is recommended instead.Specs: