The metal piece? I have one somewhere....I'll see if I can get time to measure it...
I know the bottom outlet is 4.25 inches...the tank has a 3 inch inlet...the hose between has to reduce from the one to the other...might be something you want to do away with so you can use a standard 3 inch neoprene hose instead of trying to get adapters together or buying an NOS hose for around $100...
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!