With the 5.5" GRAV Circuit Rig, you'll get twice the rotation. The intake hole's angle allows water and vapor to spin quickly, creating a significant centrifugal force. The vapor is cooled, making each hit smoother, and the effect is amplified by the dual-stacked chambers. With the 5.5" Circuit Rig, there's no need to be concerned about splashback because the acute bend in the mouthpiece retains all water inside the rig. All you have to do is pour roughly 0.5" of water into this item, which includes a 14mm female-jointed dome-less nail made of heat-tolerant quartz, and then you can get right down to the fun stuff.