In-car drink system quick disconnect the nipple should be attached to the drink tube going to the bite valve whilst the coupler is valved so won't allow liquid to syphon from the drink bottle when disconnected. The coupler has two methods of disconnection, one being the blue release button, but it is also designed to break away under load so will automatically de-couple should the driver need to exit the vehicle quickly in an emergency. Connection to the drink tube is via 8mm push-on tails.