Water filtration for your vape pen is now easier than ever! With this Petite Pocket Cart Rig Bubbler, made from quality borosilicate glass, you can get larger hits with more powerful flavor from most vape pens with a 0.5mL or 1mL cartridge. The pocket bubbler measures 5 inches (12.7 cm) tall, features a 12mm cartridge joint, and has an attached downstem diffuser. Details: 5 inches (12.7 cm) tall 12mm cartridge joint Borosilicate glass bubbler Attached downstem diffuser Functions with most 0.5mL & 1 mL cartridges