When you add the GravityWorks Carbon Element to your Platypus GravityWorks water filter, you get the freshest tasting water possible no matter where you are. . Carbon Element easily splices in after the Hollow Fiber Element of your GravityWorks filter with the included hose segment. Helps to remove flavors, odors, and many organic compounds from filtered water. Ensures the best taste possible. 40818067000 19770100012 6700