This is a contract amendment for the manufacture of a butterfly valve, primarily updating clauses and providing detailed submission and compliance instructions. The performance location is not explicitly stated, but inspection and acceptance of materials and packaging must occur at a contractor-provided CAGE code and address, with any change in production facilities requiring written approval from the Contracting Officer. The budget is not specified. Key requirements include using the specific design from the listed CAGE code and reference number, marking items per MIL-STD-130, and prohibiting substitutions without prior written approval. Contractors must be authorized distributors of the original manufacturer's item and provide proof with their offer, and all invoices must be submitted electronically through the PIEE-WAWF system.