A washing machine may include a static wash tub, a rotatable vertical axis wash basket in the static wash tub, and a drive motor for rotating the wash basket. A closure may direct wash liquid from the wash basket to a catch basin. A flange may be attached to the closure so that an unattached edge ends within the catch basin. The unattached edge may end below the surface of a first volume of wash liquid to minimize migration of wash liquid and/or vapor from the washing machine. The unattached edge may end above the surface of a second volume of wash liquid less than the first volume to minimize agitation of wash liquid in the catch basin.