I'm just trying to get everything priced. I broke my diffuser the first day I got my piece but it still hits fine, just need to put more water in it. I'm needing to know how I can find out the joint size or whatever. I believe it would be 18.8 cause my old bong's setup was much smaller then this one. But I just need to make sure before I go and order/purchase anything. How can I tell or measure it or whatever? I will also be adding a precooler to this order as well. This is also why I need to find out the size. The bong itself is two feet tall, glass on glass. Here's a picture when I first got it.