Review on 🔍 Aquaboon SDC 45 2005 FPMB BB5 20 Replacement Filtration – High-Performance Solution by Cindy Vang

They are listed as 4.5 inch OD. 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 like the size is correct until I put it in the case. Good price but not worth the price as wrong size.