Let's start with the check valve:
You want the 3/8" Kynar® Liquid/Gas Check Valve.
Next the tape:
Any tape that is non-porous and will seal without shrinking. The
problem we had with electric tape is when it got hot, it slipped down
on the jar. That is why we sealed with it and put a rubber tape around
it too stop the slip.
The stainless steel:
We recommend the 316l for best results. If you can not afford that,
then use the 302.
Plexiglas:
Minimum of a 1/4"
Glue:
We have tried many types and there are alot of good products out
there. We recommend a super glue to adhere the pieces and then seal
with the amazing goop.
I hope this helps. Sounds like you are headed in the right direction.
Good luck!