NOAA intends to award a sole source purchase order to Vaisala, Inc. for replacement parts of Vaisala Present Weather Visibility Sensors (PWD22) and accessories, as they are the manufacturer and sole distributor. The parts support maintenance at visibility stations in Jacksonville, Mobile Bay, and Narragansett Bay PORTS®. Delivery is required within 60-90 days from the date of award. No budget amount is specified. Firms that believe they can meet the requirement may submit substantiating documentation within 15 days after publication of this notice.