Insulated hose (Dirt-Shield, UV protection and light insulation against heat or cold) and drinking valve (Helix Valve) in a set as a replacement part for the Source hydration systems with SQC (Quick Connect) preparation (also fits the current models from deuter da identical). Also suitable for deuter models from model year 2011 (2.0 litres and 3.0 litres, but not 1 litre version! ).