The Outdoor Products Hydro Bite Valve serves as a reliable replacement part for any Outdoor Products Hydration Reservoir or Hydration Backpack. The 3.8 molded Thermo Plastic Elastomer material provides a soft and comfortable bite. Water flow is regulated by biting down on the valve while sucking the water in. It supplies an easy means to get water while you re hiking camping or going on a run. This clear 3.0 hydration pack bite valve screws easily onto the hose attachment for a quick replacement thanks to the threaded screw attachment. This will replace the valve on any of the Outdoor Products Hydration Bladders or Fieldline Hydration Bladders. This can also be used on the Outdoor Products BWT075OP04 .75L Tritan Water Bottle to replace broken bite valves. This is always great to carry extra while on your next outdoor adventure and takes up little space. Add a few to any emergency adult repair kits you take camping or hiking in case of emergencies. The dimensions are 3.8 x 3 and weight is 0.03 lbs.