This is a sole source requirement for the repair of one butterfly valve, which is a Critical Safety Item. The government lacks sufficient data to contract with any source other than the current one, and award will be made under an existing Basic Ordering Agreement (BOA). New sources must obtain Government Source Approval prior to award, and the approval process cannot be delayed for this procurement. No specific budget amount, performance location, or submission timeline is mentioned in the description. Prospective bidders who are not already approved sources must submit all required data from the NAVSUP WSS Source Approval Brochure to be considered.