The Volcano Solid Valve Mouthpiece for Storz & Bickel is designed to be used with the Solid Valve system for the Volcano Vaporizer. The mouthpiece is the part you attach to the balloon valve after the balloon is filled and removed from the heating chamber. Once the mouthpiece is connected, you can start enjoying the bag full of vapor. This product is the same as the original mouthpiece which came with the original vaporizer purchased. Before you purchase this part, make sure your Volcano Vaporizer has the Solid Valve system. This mouthpiece will not work with your device if it has the Easy Valve system.