The tub skimmer 'Maxi' consists of three lateral floats which support the collecting trough. The oil pours into the tub over the overflow edge, together with a small amount of water.
A buoyant suction pipe leads from the tub skimmer to a pump which sucks in any liquid which is in the tub.
The adjustment is determined by the flow rate of the downstream pump.
The tub skimmer can be actuated by any appropriate oil spill pump.