Platypus GravityWorks Replacement Reservior Kit Clear 4.0L Kit. The Dirty Reservoir Replacement Kit includes a special extension tube that can be added to the 2.0L Dirty Reservoir(sold separately) to collect and deliver water containing a small amount of debris mostly dirt and mud and then used to filter the remainder of your drinking water supply to drink clean. A special closure system (Pleatly Zip) that provides an extra level of filtration is perfect for muddy fords dusty roads and grueling days in the desert. Using the reservoir filter with a hose and squirt bottle you can be confident that your water has been filtered and is safe to drink. Specifications for Platypus GravityWorks Replacement Reservior Kit: Manufacturer: Platypus Age Group: Adults Color: Clear Features of Platypus 2L GravityWorks Replacement Reservior Kit Choose replacement dirty and/or clean reservoir bags. Unique dual-layer laminate combines a rugged exterior with a food-grade taste-free interior. Reservoirs are interchangeable with any GravityWorks system thanks to quick-connect fitting allowing you to create the capacity you need for any trip. Package Contents: Platypus GravityWorks Replacement Reservior Kit 6.0L Dirty Reservoir With Quick Disconnect 6.0L Clean Reservoir Platypus 3136: GravityWorks Replacement Reservior Kit Clear 4.0L Kit