This set will replace the entire top portion of your VOLCANO Vaporizer with the SOLID VALVE System or act as your first valve system, if you only own the base VOLCANO. This is one of two different valve systems available for the VOLCANO, the other being the EASY VALVE System. By choosing the Solid Valve system, you will be able to assemble your own balloons for the Volcano from a 3 meter roll, cutting them to your size preference. This is less expensive over time, however requires more effort than the EASY VALVE System upon initial balloon assembly. If you are interested in changing from the EASY VALVE System to the SOLID VALVE System, this is the set you need. Everything you need, other than the base Volcano, is included in the box.