An end closure member (1) with a feed-through (5) having a feed-through entry opening (8) and a feed-through exit opening (9) and connection means (10) for forming a gas-tight connection between the end closure member (1) and the feed-through (5), the feed-through entry opening (8) cross-section being larger than the feed-through exit opening (9), and the connection means (10) being located in the area of the feed-through exit opening (9).