Before flaring the ends of the tube,

Cutting the tank port.
It's good to have a port into the dirty tank for cleaning and maintenance. The cut isn't easy to make (especially since I was using a bulky skilsaw), so getting this right was tricky. I made this simple jig to run a pen around, and then I actually used it to hold the skilsaw (notice the cut at the top of the wood). It somewhat worked.

Enough to hold the tank port

Photo album generated by album generator from D. Madison's Marginal Hacks on Thu Jan 28 03:52:59 2016