The Solid Valve Mouthpiece Tip for Storz & Bickel Volcano can be used with the Solid Valve system for the Volcano Vaporizer. This mouthpiece tip (also known as lip piece) is made of plastic and is the part found on the end of the mouthpiece. If you often misplace your lip piece, then keeping this product as a spare will prove handy for you. If you share your Volcano Vaporizer, you may also want several extra mouthpiece tips to ensure hygiene and cleanliness. Before you purchase this part, make sure your Volcano Vaporizer has the Solid Valve system. This mouthpiece tip will not work with your device if it has the Easy Valve system.