So I bought a bong with freezer coil. Waited 3 weeks for it to come from china. When I got it there was no glycerin in the coil. So I bought glycerin and spent 3 days filling this thing with a tiny makeshift funnel. Then my daughter informs me I used the wrong type of glycerin. Tiny hole not get all that "beauty" glycerin out. And even if I could the right type of glycerin you can't touch. If you ever want a freezer coil bong buy one that come preload with glycerin. I am going to throw this bong of my balcony. It didn't even come with a plug for the tuny hole so i used duct tape. The coil is so tiny i can't clear this freaking bong it's garbage!