This is a presolicitation notice for the supply of 27 units of a specific safety relief valve (NSN 4820-01-493-7731). The contract is subject to the Service Contract Act, but the place of performance is currently unknown. Only approved sources, specifically EMERSON (part number 111099009), are eligible to compete due to the government's lack of unrestricted technical data. Delivery is required within 615 days, with FOB origin and inspection/acceptance at destination. The solicitation is expected to be available on or after April 24, 2026, and the response date for offers is May 11, 2026.