The plug Skimmer offers a simple and proven method for the winter above the ground and above ground pool skimmers without draining all the water in a rigid outer ABS plastic and sealing air to avoid freezing during the harsh winter months as a durable and safe temperature resistant protective chemicals and even UV rays. The plug fits securely into the skimmer opening the skimmer using our exclusive Rovaseal thermal insulating layer to connect and grip off the facade. No tools are needed simply press the sheet against Skimmer rinse your existing skimmer cover to close the skimmer.Skimmer plug also serves as a replacement lid for the facades of the most specialized. Includes plug for the port empty.

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I bought mine from this sight. Go to the K-D pool parts, then to Muskin parts
http://www.pool1.com/Part.htm