The Apollo Valves 41-560-04 Hexagon Shoulder Air Cock is a high-quality fitting made of brass, designed with a double female connection for easy installation. Manufactured in the United States by the reputable brand Apollo, this product is ideal for use in hydraulic, pneumatic, pump, and plumbing systems. Its durable construction and precise engineering make it a reliable choice for various industrial applications requiring reliable fittings and adapters.