主权项 |
1. An apparatus comprising:
an annular collapsible portion; a first lip extending radially outward from a first end of the annular collapsible portion; a second lip extending radially outward from a second end of the annular collapsible portion; a ridge extending from the annular collapsible portion configured to extend into a closet collar, where the annular collapsible portion, the first lip, the second lip, and the ridge comprise a unitary structure; and at least one flexible ring located in a recessed channel bordered by the first lip, the second lip, and the annular collapsible portion. |