Keep your hydration system drip free by attaching this bite valve before you head out on a hike or run. Here, a one-piece silicone design self-seals to prevent water from escaping.. . Patented one-piece silicone design. Bite valve self-seals to eliminate annoying drips. BPA/BPS/BPF Free: Yes. Imported. 886798004730 30981600006 1265001000