The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of seven units of a nitrogen filter, identified by NSN 7R-1680-016336191-P8, under a presolicitation notice. This item is classified as a commercial/nondevelopmental/off-the-shelf product, and it requires government source approval prior to contract award due to its flight-critical nature. Interested vendors must provide comprehensive documentation demonstrating their capability to produce the item, as only previously approved sources will be considered for this contract, which is essential for maintaining fleet support needs. Proposals must be submitted to Alexis T. Hoepfl at the provided contact information, and interested parties are encouraged to review the NAVSUP WSS Source Approval Information Brochures for detailed submission requirements.