The invention relates to a one-way valve (1; 1′) for discharge regulation of a tube, the one-way valve (1; 1′) comprising a sealing means (9) and a ring support (8), with the sealing means (9) being at least partially inserted in the ring support (8), wherein the sealing means (9) comprises a sealing element (11) and a support element (12) that has at least one opening (10), wherein the sealing element (11) is connected to the support element (12) by anchoring means (13) and rests on the ring support (12) in a closed state of the one-way valve (1; 1′) thereby covering the at least one opening (10), and wherein the sealing element (11) is of lower bending stiffness than the support element (12) and the ring support (8). The invention furthermore relates to a tube with a tube head (2; 2′) and a container (6), wherein such a one-way valve (1; 1′) is inserted in the neck (4) of the tube head (2; 2′). Moreover the invention relates to a method for manufacturing such a one-way valve (1; 1′).