I've made a few of these now, and thought I'd psot an update to show how they're coming along.
I've made them a bit lighter and thinner. This one I made longer to accomodate a filler.
[ATTACH=full]53362[/ATTACH][ATTACH=full]53363[/ATTACH]
I also modified the cap mechanisms to make it easier to adjust or replace the o-ring.
[ATTACH=full]53364[/ATTACH]
Thanks for looking :-)
-Anthony