This is a sources sought notice for market research to identify potential manufacturers of a specific filter element. The notice clarifies that three companies are currently approved sources, but it invites other companies to apply for qualification as alternate sources. To become an approved alternate source, a company must submit a comprehensive Source Approval Request (SAR) package demonstrating its ability to manufacture an item of equal or better quality. The primary point of contact for submissions is the Contract Specialist, Mindy M. Cook.