This mouthpiece is intended to the volcano vaporizer only. It is an attachment to the balloon for after the balloon is filled and removed. once the mouthpiece is on you can start enjoying your vapor without having to worry about any leaking out. Once it is on all you need to do is press gently on the piece for vapor to start coming out.
make sure that you are using a solid valve system, this item does not work on the easy vale system.