This is the bite valve sheath replacement for Mazama's GYZR™ Bite Valve. Includes 4 bite valve sheaths per package. The soft silicone sheath provides large volume fluid flow and 360-degree flow activation. Easy installation: pull your old valve sheath carefully off the mouthpiece collar and replace it with your new one. Only for Mazama INTAKE™ (NOT "ICE") and Trailflow™ Reservoir Systems and GYZR™ and UltraValve™ Drink Tube Sets. GYZR™ sheaths WILL NOT FIT Mazama 1/4" ID Drink tube reservoir systems including AXE, DUAL, Backflip, or DoubleCap Reservoirs. GYZR™ sheaths WILL NOT FIT other brands' bite valves or bottles. Replacement bite valve sheath 4 pack:

• 360 degree high flow bite valve
• Food grade Silicone sheath