POL Gas Bottle Dust Plug

I needed a dust plug for a LPG gas bottle and I couldn't find one online to print, so I designed one.
It is designed to fit a standard 4.5kg or 9kg gas bottle commonly used on BBQ's here in Australia.
It prints without supports and can be used with or without an o-ring.
The o-ring used is a 1-110, it has a cross section of 3/32", O.D of 9/16" and I.D of 3/8".