The tank comprises a container (2) of printed publication plastic, introducing a bocchettone integral (3), whose ring-like portion finishes is overprinted them on a tubular metallic file (5). The portion (5b) of such file (5) that emerges from the bocchettone (3) is means supply of connection with a stopper of closing to estate (4). The portion (5b) of the file (5) drowned in the bocchettone (3) is supply, on at least a part of its surface, of continuous a ring-like covering (6) constituted from an overprinted termocollante material on such file (5) preliminarily to the sovrastampaggio of the bocchettone (3). (Figure 1 and 2).