This Burtrail switch bite valve tube nozzle replacement set, compatible with most popular hydration packs. Lightweight, high flow valve self seals after each sip and can be opened and locked with one hand to prevent leaks. The magnets of the hydration tube clips can keep the drinking valve and tube in normal use when you are in a move, but allow the tube to pull when the pressure is too high. At the same time, these hydration tube clips can be fixed on your bag straps, belt or your backpack, easy to take, releasing your hands. Includes: switch bite valve and magnetic water tube clip, the combination of these two is an indispensable hydration accessory for you.