Presolicitation notice from the Department of Defense, Department of the Navy, for the procurement of a valve assembly. The valve assembly, identified by NSN 7R-1680-016049687-P8 and reference number 2050000-102, is required in a quantity of 7 each. Delivery is FOB origin. This part requires engineering source approval to maintain its quality. The approved source(s) retain data rights and manufacturing/repair knowledge that are essential for maintaining the quality of the part. An alternate source must qualify according to the design control activity's procedures. Government source approval is required prior to contract award due to the item's flight criticality and inadequate technical data. Only previously approved sources have been solicited. Interested parties must submit the required information for source approval. The proposed contract action is for supplies or services for which the Government intends to negotiate with only one source. All responsible sources may identify their interest and capability to respond to the requirement. The Government will consider all proposals received within 45 days. The Government is not using the policies contained in FAR Part 12 for this solicitation, but interested persons may identify their capability to satisfy the requirement with a commercial item within 15 days.