After you????????ve worn out the nozzle on your hydration packs during those long outdoor treks, its time to replace them with the Hydraulics Silicone Nozzle by Osprey. Each pack comes with 3 silicone nozzles, and is compatible with Osprey Hydraulics reservoirs. . ????. . . . . . Silicone. . Replacement of bite valve nozzles. . 3 Pack. . Each nozzle weighs 0.02 lbs.. . Compatible with Osprey Hydraulics reservoirs. . Imported. .