Adapter for fastening a filter element

An adapter (1, 1′) for fastening a filter element (25, 25′) in a cylindrical receiving opening (18) of a bottom part (19) of a lower piece of a filter housing, said adapter comprising first and second parallel peripheral grooves (3, 5) on an outer circumference of the adapter (1, 1′) and formed with outwardly facing base surfaces (6), a dividing wall separating the peripheral grooves (3, 5) and having oppositely facing first and second inner side surfaces (10, 11) facing into the respective first and second peripheral grooves (3, 5), first and second outer side surfaces (12, 13) formed respectively in the first and second peripheral grooves (3, 5) and facing toward the respective first and second inner side surfaces (10, 11), first and second seals (4, 7) arranged into the first and second peripheral grooves (3, 5) to permit fluid-tight separation of a non-filtrate chamber, which surrounds an external jacket of the filter and from which medium to be filtered can be delivered to the filter, from a filtrate chamber into which the filtrate can be introduced from the filter, the seals (4, 7) being injection molded onto the base surfaces (6) of the peripheral grooves (3, 5), and engaging the first and second inner side surfaces (10, 11) while being at a distance (16, 17) from the first and second outer side surfaces (12, 13) the first and second seals (4, 7) being connected to each other via at least one web (20) extending in an axial direction, the web (20) being spaced outward from the base surfaces (6) and engaging an outer circumferential surface of the dividing wall, the seals (4, 7) being unconnected to one another on opposite circumferential sides of the web (20).