A device that selectively closes an inlet opening in a face frame of a throat in a pool skimmer, the throat having an outlet opening in a wall of a chamber of the pool skimmer, the throat being in a water flow communication with the chamber, the chamber accessible through a removable lid, the device comprises a body sized larger than the inlet opening, a support member sized and shaped to be positioned, during use of the device, in a contact with the wall of the chamber and adjacent the outlet opening of the throat, and an elastic member being in a first connection with the body and in a second connection with the support member, the elastic member further being in a tension during use of the device.