The Volcano Solid Valve Starter Set includes everything necessary to upgrade the top portion of your Volcano Vaporizer to the Solid Valve System. Whether you have an existing Volcano unit or are looking to add your first valve system, this set is ideal. The Solid Valve System is one of two compatible valve systems for the Volcano, alongside the Easy Valve System. With the Solid Valve System, you can customize your vaporizer experience by assembling your own balloons from a roll of balloon material, allowing you to choose the exact size you prefer.