I dont know why, but yesterday, i bought another bong, and when i got home, i realized it had both a slider AND a carb. I can honestly say in years of toking, i have never used or even seen them. It is the single greatest 'apparatus' i have ever owned or used! Its just a small thing, like an inch across, and about 6 or 7 inches tall, but man, i fucking love it. just wanted to get this out there