The Series 5405 Straight Male NPT x Female NPT hydraulic adapters, constructed from high-quality stainless steel, are essential components designed to create secure and reliable connections for fluid and gas transfer in hydraulic systems. These adapters utilize the National Pipe Taper (NPT) standard, which features tapered threads that form a robust 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 a trusted choice in the U.S. for over 100 years, making them widely used in various applications. However, these connections are best suited for single assembly applications and are not recommended for frequent disassembly due to potential wear on the threads. These stainless steel adapters provide professionals with dependable and efficient hydraulic solutions, ensuring optimal performance in fluid transfer systems.