Method for connecting a suction hose (2, 202, 302) for bodily fluids to a container, said method having the steps of - providing a hose adapter (10, 110, 210, 310) arranged on a hose portion (3, 203, 303), a seal having at least one annular sealing surface (30, 130, 230, 330), and a container on which a hose adapter mating part (20, 120, 220, 320) is arranged, - establishing mechanical contact between a first contact surface (17, 117, 217, 317) provided on the hose adapter (10, 110, 210, 310), the seal comprising at least one annular sealing surface (30, 130, 230, 330), and a second contact surface (22, 122, 222, 322) provided on the hose adapter mating part (20, 120, 220, 320), in a first orientation of the hose adapter (10, 110, 210, 310) relative to the hose adapter mating part (20, 120, 220, 320), and - rotating the hose adapter (10, 110, 210, 310) from the first orientation into a second orientation in which by interaction between portions of the hose adapter (10, 110, 210, 310) and portions of the hose adapter mating part (20, 120, 220, 320), such that the seal comprising the at least one annular sealing surface (30, 130, 230, 330) is squeezed between the first contact surface (17, 117, 217, 317) and the second contact surface (22, 122, 222, 322), characterised in that for providing the hose portion (3, 203, 303) arranged on the hose adapter (10, 110, 210, 310) an end portion of the hose portion (3, 203, 303), the inner cross-section of which corresponds to the cross-section of the through-opening (12, 122, 212, 312), is pushed into a recess which adjoins the through-opening (12, 112, 212, 312) on the hose side and which is concentric with the through-opening (12, 112, 212, 312) and the extension of which is matched to the outer cross-section of the hose portion (3, 203, 303), until the end face of the end portion of the hose portion (3, 203, 303) rests on a step and the outside wall of the end portion of the hose portion (3, 203, 303) rests on the wall of the recess, and at least either the end face of the end portion of the hose portion (3, 203, 303) or the outside wall of the end portion of the hose portion (3, 203, 303) is fixed, and in that upon rotation of the portion (11, 111, 211) of the hose adapter (10, 110, 210, 310) provided with the part of the through-opening (12, 112, 212, 312) communicating with the interior (4, 204, 304) of the hose portion (3, 203, 303) out of a first orientation into a first orientation the locking element (13, 113, 213, 327) is guided along a third contact surface (23, 123, 223) at least during parts of the rotation, the spacing (d) of which contact surface from the second contact surface (22, 122, 222, 322) from the position of the locking element (13, 113, 213, 327) in the first orientation increases towards the position of the locking element (13, 113, 213, 327) in the second orientation. - providing a hose adapter (10, 110, 210, 310) arranged on a hose portion (3, 203, 303), a seal having at least one annular sealing surface (30, 130, 230, 330), and a container on which a hose adapter mating part (20, 120, 220, 320) is arranged, - establishing mechanical contact between a first contact surface (17, 117, 217, 317) provided on the hose adapter (10, 110, 210, 310), the seal comprising at least one annular sealing surface (30, 130, 230, 330), and a second contact surface (22, 122, 222, 322) provided on the hose adapter mating part (20, 120, 220, 320), in a first orientation of the hose adapter (10, 110, 210, 310) relative to the hose adapter mating part (20, 120, 220, 320), and - rotating the hose adapter (10, 110, 210, 310) from the first orientation into a second orientation in which by interaction between portions of the hose adapter (10, 110, 210, 310) and portions of the hose adapter mating part (20, 120, 220, 320), such that the seal comprising the at least one annular sealing surface (30, 130, 230, 330) is squeezed between the first contact surface (17, 117, 217, 317) and the second contact surface (22, 122, 222, 322), characterised in that for providing the hose portion (3, 203, 303) arranged on the hose adapter (10, 110, 210, 310) an end portion of the hose portion (3, 203, 303), the inner cross-section of which corresponds to the cross-section of the through-opening (12, 122, 212, 312), is pushed into a recess which adjoins the through-opening (12, 112, 212, 312) on the hose side and which is concentric with the through-opening (12, 112, 212, 312) and the extension of which is matched to the outer cross-section of the hose portion (3, 203, 303), until the end face of the end portion of the hose portion (3, 203, 303) rests on a step and the outside wall of the end portion of the hose portion (3, 203, 303) rests on the wall of the recess, and at least either the end face of the end portion of the hose portion (3, 203, 303) or the outside wall of the end portion of the hose portion (3, 203, 303) is fixed, and in that upon rotation of the portion (11, 111, 211) of the hose adapter (10, 110, 210, 310) provided with the part of the through-opening (12, 112, 212, 312) communicating with the interior (4, 204, 304) of the hose portion (3, 203, 303) out of a first orientation into a first orientation the locking element (13, 113, 213, 327) is guided along a third contact surface (23, 123, 223) at least during parts of the rotation, the spacing (d) of which contact surface from the second contact surface (22, 122, 222, 322) from the position of the locking element (13, 113, 213, 327) in the first orientation increases towards the position of the locking element (13, 113, 213, 327) in the second orientation.