A fluid-tight contact implementation includes a plastic body and a flat contact(s). The plastic of the plastic body is composed of a non-shrinking, duroplastic material. The flat contact has a region encapsulated by the plastic body. The encapsulated region of the flat contact has a cross-sectional width which varies along an axial direction of the flat contact. Longitudinal edges of the encapsulated region of the flat contact along the axial direction are rounded.