Brand New Wide Mouth Above Ground Pool Skimmer Gasket 2 Pack Dimensions: approximately 11 3/4" Wide X 5 1/2" High. Outside Dimensions: approximately 13 5/8" Wide X 7 1/2" High. Includes: 2 Brand-new Skimmer Gaskets. Inside Dimensions: approximately 11 3/4" Wide X 5 1/2" High. Outside Dimensions: approximately 13 5/8" Wide X 7 1/2" High. Compatibility: The wide mouth skimmer gaskets fit most above ground pools.