Jun 09, 2021 · Agitation sets for standard GL 45 laboratory bottles are available for 100 ml, 250 ml, 500 ml, 1 l, 2 l, and 5 l in size. New way of reliable mixing Instead of using a propeller or a magnetic stir bar, a flexible agitator tube and an inserted stainless-steel agitator rod provide clockwise or counter-clockwise rotational movement.