All you need to mount Ventify is a Ventify package containing a valve, a ring and a cutout template, as well as a pen and scissors.
Place the cutout template on the top half of the bag and mark with a pen. Cut carefully along the marking. Insert the ring into the bag with the flat side up, and place directly under the middle of the cut hole. Place the valve over the ring with the arrow pointing upwards, and press with the base of your hand. When you hear a clicking sound, the valve is mounted and ready to use!
