EZ-Flex Filter Kit EZ-Flex Filter And 2 Reusable End Caps. Expandable media filter. EZ Flex expandable filter uses a simple, three-step assembly process that is much faster and easier than any expandable filter on the market. Other expandable filters can take up to 10-15 minutes to assemble, requiring the installation of up to five combs. Because the EZ Flex expands to the correct size without using combs, it can be assembled in less than 30 seconds. Starts with the 2002yr and Newer