An apparatus for collecting the alcoholic vapours that usually escape from fluids during the process of vinous fermentation. It is a conical vessel or cap, covering a hole in the top of the fermenting tun, which is in other respects closed air-tight. The conical vessel is surrounded by a reservoir of cold water, so that the spirituous vapours, rising from the working tun, may be condensed when they enter the cone, and, 'running down its sides, be conducted by a pipe back into the tun. The cap is provided with a tube, to carry off the gaseous portion of the vapour which has not been condensed.