The Grav Labs 18" Steamroller is a gargantuan pipe of all pipe. With its 18 inch long size, watching this steamroller milk up before clearing it is spectacular. It has a carb up front in front of the funnel bowl. The included 19mm male funnel bowl sits in a 19mm female joint and is held together with a 19mm plastic joint clamp for extra security while using. This steam roller features 50mm diameter tubing and has a 5mm thick borosilicate glass wall for that special quality and durability feeling. When not in use this steamroller can be easily placed down without rolling over due to its marble feet underneath the joint and bowl. Careful clearing this one, its a heavy hitter!