The HyFLO(TM) is a streamlined, one-piece bite valve that offers fast-flowing, self-sealing, leak-free performance. Made with a soft, taste-free, medical-grade silicone, the HyFLO stands up to years of use. The bite valve is included on all Big Zip(TM) EVO & Hoser(TM) Reservoirs and is compatible with all legacy Platypus shutoff valves. Specs Weight (Standard): 0.2 oz Weight (Metric): 0.01 kg Width (Standard): .8 in Length (Standard): .9 in Height (Standard): 1.4 in Material(s): Silicone Country of Origin: Made in Taiwan