How much PSI will a growler safely hold?
I made a carb cap. I know it won't do much for keeping a beer from oxidizing but it should help maintain the carbonation as I enjoy it through the week.
Parts:
- 3/8" JIC male cap. Hydraulics section of Princess Auto. Is this aluminum?
- Ball lock gas post.
- Poppet.
- Ball lock o-ring.
-Thread tape.
Put the 3/8" cap into a vice and drill a 1/4" hole through it. Clean it up. Drill a 1/2" hole through a growler cap. Place ball lock o-ring over the JIC cap, all the way down to the nut. Thread that through the bottom of the growler cap. Don't forget to thread tape it. Place poppet on top. Thread on ball lock post. Tighten with 1/2" socket and 7/8" (or whatever size yours is) wrench on the post.
Test for leaks with low pressure.
Drink some beer, cap the growler and hit it with a few PSI to keep it from going flat. Don't blow up your growler! I did my test with gloves and goggles.

Enjoy!

Sent from the brew timer.