? Product Description Compatible Models: The Water Filtration System Replacement Certified NSF/ANSI 42 372 perfectly compatible with Berkey Travel, Big, Royal, Imperial, Crown,Light Series, Propur Traveler, Nomad, King, Big Series, Gravityy 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,Materials: The Replacement Filters are made of 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,Easy to Carry: Ideal for home, travel, outdoor activities, and emergencies, such as water shortage,the filter can provide you with healthy, clean, and quality water, both at home and outdoors,Long Service Life: To prolong the life of your appliance and achieve optimum performance, we recommend you replace the filter every 6,000 gallons per pair, which will vary based on water conditions,Note: This water filter element is not sourced by or sponsored by Berkey. The manufacturer's name has been used for reference purposes only We offer premium quality and the best service. Total dissolved solids (TDS) levels are not the only indicator of water quality. Our filters do not reduce TDS values; they only filter out chlorine and improve the taste of the water. ? Specifications size 4 Pack color Black model W98 material Coconut Shell,Activated Carbon itemWeight 2.87 pounds partNumber W98 manufacturer Wadoy productDimensions 2.0 x 3.1 x 3.9 inches ? Fast Shipping | ? Quality Guaranteed | ? Customer Support 30-Day Returns ? 100% Satisfaction