Source Tactical Universal Tube Adapter for Hydration Systems Universal Tube Adapter - Fast hydration refills through the drinking tube without the need to remove systems from the user's back Fits a variety of water bottles and indoor/outdoor taps and faucets While filling the adapter expands slowly until it reaches its full length, which signals that the hydration pack is at its full capacity. Constructed of anti-bacterial TPE polypropylene Filling time from a Tap: 2L in 45 sec, 3L in 65 sec - Filling Time from a Bottle: 50 sec for 1.5L bottle