The WaterBasics RED Line Replacement Filter provides the maximum protection for drinking water safety, by incorporating RED Line Protection with the added convenience of WaterBasics Series II connectivity to easily connect to WaterBasics Water Bottles, Gravity Flow Filtration Kits, Bag to Bag Filtration Kits, WaterBasics Pumps and Hydration Bladders. With 120 gallons of water filtration capacity the RED LINE filter can supply an individual or entire family with fresh clean filtered water. The RED Line Replacement Filter comes complete with a mouthpiece and straw so you can drink directly from any water source if the circumstance requires. No other replacement Filter is usable straight out of the box. You can depend on WaterBasics.