A device for distributing a fermented liquid uniformly over a fermented cap includes a joint member, an impeller, a shaft and a flow conditioner. The joint member has a top opening, a bottom opening, a side opening, a through-opening extending from the top opening to the bottom opening and a side-through-opening extending from the side opening to the through-opening. The impeller includes a one-piece conical shaped body that has a central-through-opening. The shaft extends through the through-opening of the joint member and through the central-through-opening of the impeller. The flow conditioner extends from the bottom of the joint member and surrounds the shaft. The bottom of the flow conditioner is shaped to match the shape of the fermentation tank.