I seen a guy that had taken a section of PVC and glued a cap on the bottom and screw caped the top.
He had drilled two holes in the side. The one toward the top he put a metal tire air valve in it.
The one on the bottom side he put one of those air tank drain water drain valves.
He teflon taped the screw cap.
Once he had it filled it with whatever he wanted he cracked that drain valve, then filled it with argon or other gases once the gas was escaping the drain valve.
He'd shut it and pressurize the container.
He said the higher press helped ensure no moisture inside.
It sounded good to me, but I've not tried it yet.
What do y'all think?
