Abstract: A blow-molded synthetic plastic beer container has a narrow neck and cover mounted in gas-tight relationship thereto. A rubber stopper is positioned in the cover and extends into the neck. The cover has a pair of opposingly projecting arms, with reinforcing ribs thereunder, receiving the attachment of a tap fitting which includes opposingly projecting fastening stirrups cooperating with the projecting arms. The cover further includes a depression therein in the center of the top thereof, the depression having a relatively thin-walled bottom with a hole therein, and the rubber stopper has a circumferential groove therein positioned in the hole.