EVOC Comet Bite Valve Bite Me, Bite You, Boom, Boom Hydration packs make carrying and consuming water while riding easy. The EVOC Comet Bite Valve has optimized construction that increases the flow rate. The bite valve is BPA and PVC-free. Just bite the valve, and water comes out. It's as simple as that! Features BPA and PVC-free for the purest taste Optimized construction increases the flow rate Bite the valve and water comes out | Evoc | Comet Bite Valve Valve