Abstract: A water closet assembly and/or closet flange seal wherein the closet flange seal includes a horn section, a body section, and a sealing fin each formed of a material having a Shore A hardness of less than about 83. The horn section includes a connecting flange, a conical wall, and a ring end wall with the conical wall being integral with and interconnecting the connecting flange and ring end wall. The body section is integral with the horn section and includes a tubular body with an outer face, a first end integral with the horn section, and a second end. The sealing fin extends outwardly from the outer body face, circumscribes the body, and is oriented in a predetermined angle relative to the outer face.