A packaging installation having at least one filler station includes a filler spout and a connection member connected firstly to a feed duct and secondly to a purge duct in order to connect these ducts to the spout. The connection member includes a spout supply pipe connected to the feed duct and a return pipe opening out into the spout and connected to the purge duct. The supply pipe and the return pipe are entirely independent of each other, such that the connection member acts continuously to connect in series the feed duct, the supply pipe, the spout, the return pipe, and the purge duct.