I can't draw a circle without it looking like an egg, but I will do my best to explain ( after 10 ounces of rye whiskey).
this is a puke box
notice how the arm from the column going into the box is lower than the arm out of the box to the condenser?
sometimes your wash/mash may "puke" if you run it to hot. Meaning the wash could boil up the column and though the worm shooting out through your distillate. The "pukebox", because the box is lower than the arm of the column, the "puke" that will boil over will fall to the bottom of the box, the valve is there so you can drain it before it comes out the worm.
If making a whiskey I place a roll of copper mesh in that pukebox. the vapors go through it removing some of the sulfates (because i have a stainless steel pot I need copper somewhere to remove sulfates).
I could replace the copper mesh with a ginbasket. A stainless basket that can hold botanicals (if i am making spiced rum, or infused gin, or infused vodka)
this basket goes into the "pukebox", I got a gin basket that fits its dimensions.
The ethanol vapor passes through the botanicals in the gin basket picking up flavor becuase the basket places the botanicals in the path of the vapor.
I have ordered a sight glass to add to the column so I can add copper mesh/nuts to remove sulfates when I use a gin basket.
so I either add copper mesh, or a ginbasket in that chamber every time i run my still. Hope that helps.
if not PM me and I will explain more.