This is my latest project that i picked up. Problem is it's missing the main components. Looking for some help from the HAMB as I'm sure there are a few who can answer my question. I've searched here and the internet. I have found info on all types of blasting cabinets, but none that are similar to the one I picked up. I'm looking at the siphon system that TP sells, but am not sure what the 3" diameter tube in the front that goes down to the bottom of the cabinet. Is this for the pickup to go ? Is this a vent ?? There is a cap that inserts in the bottom... or top. Just not sure what its function is. Should I try to work with it or plug it up and forget about it? Any help is appreciated. Thanks for reading.