Sorry for the slow reply. The UAT can be printed in PETG or ABS. If printed in clear it is just translucent enough to see bubbles and fuel. I use a SIX10 resin epoxy to coat inside and out. Then epoxy the lines in place and seal tank together. It is not serviceable but for 50 cents you can just replace it. I bought a bag of 10 felt pickup a couple years ago which are used in an ATV or lawn mower type application. Will try to find the part number but any of them will work. Here is the link to the Thingiverse file.
https://www.thingiverse.com/thing:4305344
I used Fusion360 hobbiest software to create the model so legally I can't sell them.