too close to the flame to glue,, unless u do a fine job, and dont burn it but thats going to be quite impossible.
If you still have he rest of it, you can easily fix it. I would recommend using either JB WELD or using an epoxy. Both are heat resistant and work like a dream. I fix my friends bongs for a few bucks depending on how fucked up it is. Sent from my iPhone using Grasscity Forum
If you can find a slider bowl that will fit that tube then you dont need to repair it. But you do need to clean that thing.