GRAV Upline Upright Bubbler Design|Portable/Compact It features a gridded stem

It features a gridded stem line at the bottom chamber to start filtration

Featuring a 18mm female joint and sits on a wide thick base

You won't have to worry about it breaking or cracking easily

With its fat chamber and amazing diffusion

it's a statement piece

GRAV Upline Upright Bubbler Design|Portable/Compact It features a gridded stemIntroducing the GRAV Upline Upright Bubbler! This behemoth is GRAV Labs' latest & greatest creation. Standing over 8'' inches tall, this bubblers packs a bunch with its unique Upline spines. The fat chamber allows you to fill it for massive super cooled hits! Made from super thick 75mm tubing, this bubbler is a tank. The unique pinched mouthpiece eliminates any possible splashback. Designed by Micah Evans in Austin, TX., this bubbler is a must have