The invention relates to a first component (12, 13, 31, 36a-36c, 50, 62) intended for being connected to a second component (14, 15, 51, 63a-63c). The first component (12, 13, 31, 36a-36c, 50, 62) comprises at least one recess (16, 17, 32, 37a-37c, 52a-52c, 64a-64c) having at least one opening (19, 20, 34, 35, 54a-54c) which will be filled at least in part by the second component (14, 15, 51, 63a-63c) which latter is in a flowing condition during establishment of the connection, at least in the area of the opening (19, 34, 54a-54c). A reduction in cross-section (18, 33, 38a-38c, 53a-53c, 65a-65c) is provided in the recess (16, 17, 32, 37a-37c, 52a-52c, 64a-64c) that will be back-filled by the second component (14, 15, 51, 63a-63c) during establishment of the connection. The reduction in cross-section (18, 33, 38a-38c, 53a-53c, 65a-65c) is provided in the recess (16, 17, 32, 37a-37c, 52a-52c, 64a-64c) on the side facing the second component (14, 15, 51, 63a-63c).