This opportunity is for a parts kit for a 6-inch ball valve, designated as Special Emphasis (Level I) material for a crucial shipboard system, with performance at a location that may differ from the offeror's address. The contract will be awarded bilaterally and is DO-certified for national defense under the Defense Priorities and Allocations System. The contractor must provide and maintain a quality system per ISO-9001, with specific certifications required for materials, hydrostatic testing, and welding procedures. A one-year warranty from the date of delivery is required for the supplies. This is a total small business set-aside, and NAVSUP WSS Mechanicsburg will consider past performance in the evaluation of offers.