The Magnaloy Coupling Model 300 with a 7/8 x 3/17 hub is a high-quality and reliable coupling designed for hydraulic fluid reservoirs. Manufactured by Magnaloy Couplings, this product is specifically designed for use in industrial applications requiring hydraulic systems. Its durable construction and precise fit ensure optimal performance and longevity, making it a valuable component for businesses in need of efficient and dependable hydraulic systems.