This is a glass purge valve for Glass Hookahs such as the Pharaoh's Glass Hookahs, Spyro Design Hookahs, Vapor Glass Hookahs and Art Hookah. It comes in 2 styles, a cylindrical shape and a ball shape. Please note that this Glass Purge Valve does not works on brands such as Lavoo Hookahs, Lust Hookahs, Luna Hookahs, Roi Hookahs and Evolution Hookahs since they use a smaller Universal Purge Valve.