This is a notice for a sole-source valve item (NSN 4820-01-508-5651) currently approved for manufacture only by USI Inc. The item must be acquired directly from the actual manufacturer, as the Government does not possess the technical data or rights to source it elsewhere. Interested companies may submit information to the contract specialist to be considered as potential sources. To become an approved source, a company must apply through the DLA Source Approval Request (SAR) program and demonstrate, at its own expense, that its product is equal to or better than the original equipment manufacturer's item. No budget, performance location, or specific timelines were provided in this description.