The Defense Logistics Agency (DLA) Land and Maritime is seeking sources for a one-time procurement of four units of NSN 4820014179397, specifically a DISK, VALVE. Interested vendors must provide the necessary documentation to become an approved source for this item, as DLA does not possess the technical data for it. The approved manufacturers for this NSN include VACCO INDUSTRIES with specific part numbers listed in the solicitation. Interested parties are required to complete the attached market survey and submit it to Richard Shemenski via email by 1:00 PM EST on December 19, 2025, to be considered for this opportunity.