These are listed as 4.5" O.D. They are 4 and 1/8 inch outside diameter, although the packaging says 4.5 inches. It was also a problem when installed as filter tips and not well aligned. This resulted in it not sealing well and leaking very slowly. I will not order these again. I didn't notice the small size until I installed it as at first glance it seems the size is correct until I put it in the case. Good price but not worth the price as wrong size.
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