No part is Revain's fault as delivery was on time and the product was properly labelled. I believe this to be the case is a manufacturer error as this product is mislabelled. Not entirely sure. I ordered 2 of these Vibrant 1458. I measured both seals and they were 2.5" ID. Both seals were marked Vibrant 1458. According to the Vibrant website has a 1458 3" ID. All reviews said the inside diameter is 3". I had to return both parts as they are the wrong size. Provided my old 3" gasket as proof in the picture Disposal.