Eric Ross 4.0 Glass Slant Top Cap

Like the Turbo Top, you can use either side.  One side offers a straightforward quartz plug, while the alternate side not only seals the quartz but also provides an adjustable airflow feature. By rotating it, you can fine-tune the airflow restriction, effectively covering the intake tube.

Works with: 4.0 Glass Fountains, Lil Whiz, The Whiz, and the Whizard. The top and bottom are both 14mm Outer Diameter