The Osprey Hydraulics Bite Valve Cover is a durable replacement from Osprey, designed for the Hydraulics™ Reservoir and Hydraulics™ LT Reservoir. There's nothing worse than expecting a refreshing blast of water and getting a mouthful of dirt. Protect your Hydraulics™ bite valve with this easy to use cover, ensuring that next time you drink you get exactly what you're expecting with no nasty surprises. Osprey Hydraulics Bite Valve Cover Features Compatible with Hydraulics™ LT Reservoir Compatible with Hydraulics™ Reservoir