I am wanting to hook to glass tanks together. What type of bulkhead fittings do I need to do this with? They are going to be either 1 1/2" or 2" holes. I have found fittings that are threaded with 2 3/8" thread on them. Could I stick this fitting through both tank holes and use two washers and nuts or is there some other fitting I could get that I could hook the two together with pvc or hose? I am needing to keep them as close together as I can. Here is the site that I found the fittings on.
http://glass-holes.com/main.sc
http://glass-holes.com/main.sc