【HIGH-EFFICIENCY FILTRATION】The BB9-2 Black Water Filters With powerful purification as the same as the original filters. This filter can removes contaminants such as inorganic minerals, heavy metals, silt, sediment, chlorine, sand, rust, odor and large particles in freshwater sources and improves the taste of water【COMPATIBLE MODELS】The BB9-2 Black Purification Elements perfectly fit the original brand.it is interchangeable with Travel, Big, Royal, Imperial, Crown Series, Propur Traveler, Nomad, King, Big Series, Gravity filter system.Doulton Super Sterasyl & ATC Super Sterasyl filter, W9361122 & W9361123 system.This washer and wingnut is accuratly designed for a tight fit to stop any leaking【SAFE MATERIALS】Our BB9 Replacement Filters are made of high quality natural coconut shell activated carbon. We rigorously control the filter material and adopt lead-free and BPA-free materials to produce the filter housing,ensuring excellent removal performance that will not leak contaminants back into your water【ECONOMICAL WATER FILTER】Affordable choice. Excellent quality that costs less than half price of the original brand Replacement filter. You can save money and enjoy clean refreshing water. These filters have a long lifespan lasting up to 6,000 gallons before needing replacement