Compatible Water Purifier Models ‎Berkey Travel BT2X2-BB, Berkey Crown CRN8X2-BB, Berkey Go GOBK-KIT, Berkey Big BK4X2-BB, Berkey Light BL4X2-BB, Berkey Royal RB4X2-BB, Berkey Imperial IMP6X2-BB. Designed to remove bacteria and other contaminants from your water, these filters are a perfect fit for Berkey light, Imperial Berkey, and big Berkey models.