Replacement Mouthpiece Push/Pull valve Round Shape Shut-off mechanism Secure lock Angled valve Dirt Shield™ – Valve cover Source's Storm Valve Kit has an angled free flow valve design, making flow easy and resealable with a twist. Disconnecting the valve so that the tube can be woven through a tight opening is convenient and its twist design makes it ideal for sealing your hydration bladder mouthpiece in cold weather. This replacement part for your hydration bladder comes in handy if you need to swap out only the mouthpiece.