Slick Rock Concrete KCC29CPSCCMNG-COALGRAY 29" x 13" Conical Coal Gray NG Cascade Fire on Glass Bowl with Scupper, Match Lit. Enjoy the unique combination of fire and water with our concrete fire on glass water bowls. With the fire on glass configuration, the water bypasses the fire components using a plumbed scupper. This leaves the interior of the bowl dry allowing for the use of a traditional electric or match lit fire unit. Aesthetically, the fire on glass option combines the more robust copper scupper, high-quality cast concrete, and glass or stone media of your choosing.