Compatible model :IT'S PURE EXPERT Blackwater filter can replace Berkey BB9-2 water filter, Berkey gravity filtration system, including Travel, Big, Royal, Imperial, Crown series. Precision designed washers are securely attached to wing nuts to prevent leakage. ❗️❗️ Connect the filter to the faucet and rinse for 1 minute before use. Note: If the faucet is not fully compatible, splashes may occur but will not affect the product. ❗❗ Water filter only uses high quality coconut grade activated carbon filter element to significantly reduce harmful substances and improve the taste of water. To get the best performance out of your water filter, extend the life of your machine by replacing IT'S PURE EXPERT filters every 6,000 gallons. Using a pair of black elements can hold 6,000 gallons of water;To protect the water filter, do not use it with brine or softened water. Carefree Warranty & Fast Customer Service : Every efforts to improve your shopping experience. If you need assistance, including pre-order / after-sales service, please do not hesitate to contact us.