Deuter Helix Valve Replacement Kit for Hydration Packs PU mouthpiece NO-DRIP TECHNOLOGY - Deuters innovative Helix Valve for Streamer hydration packs prevents leaks, even during high-intensity activities like running, mountain biking, or skiing; Mouthpiece features a push-fit cap and twist activated water-stop lock PRESSURE ACTIVATED - Light pressure on the drip-proof mouthpiece activates a perfectly regulated flow of water, while the integrated spring valve automatically closes the mouthpiece when pressure is removed EASY TO CLEAN - The Helix Valve system is easy to take apart and clean; Hand-wash with warm water and mild soap EASY TO USE - Quickly turn the flow of water on and off with a simple quarter turn of the water-stop tap COMPATIBLE - The Helix Valve is compatible with Deuters Streamer 2.0 and 3.0 hydration reservoirs