Chemglass
VirTis/Chemglass FLASK 600ML for 4" Dryer Lid, CG-1611-24, 1/PK
You will find that Industrial Service Solutions avoids gimmicks and focuses on function.
Chemglass CG-1000-43 Adapter Connecting 14/20 Top 24/40 Lower Reducing
A nice touch is that the side handle assy can be folded flat for storage.