The Series 5406 Straight Male NPT x Female NPT reducer bushing hydraulic adapters, made from durable carbon steel, are essential fittings designed to create secure connections for fluid and gas transfer in hydraulic systems while allowing for size adjustments between different pipe diameters. Utilizing the National Pipe Taper (NPT) standard, these adapters feature tapered threads that form a reliable seal through thread deformation, ensuring a strong metal-to-metal connection when tightened. The nominal pipe size can be easily identified by measuring the thread diameter and subtracting 1/4". NPT connections have been widely used in the U.S. for over 100 years, making them a trusted choice in various applications. However, these connections are best suited for single assembly applications and are not recommended for frequent disassembly, as this can lead to wear on the threads. The Series 5406 adapters provide professionals with dependable and efficient hydraulic solutions, ensuring optimal performance in fluid transfer systems while accommodating varying pipe sizes.