The Adaptall Series SS9037 Straight Male NPT x Female BSPP rigid hydraulic adapters, made from stainless steel, are designed to connect two hydraulic components with different thread types. NPT (National Pipe Taper) connections feature tapered threads that seal by deforming the threads against each other, creating a metal-to-metal connection. This design is suitable for permanent assemblies but not for connections that need frequent disassembly. On the other hand, BSPP (British Standard Pipe Parallel) male connections feature parallel threads, providing a seal through a metal-to-metal contact or an O-ring, ensuring leak prevention. These adapters allow for a secure, leak-tight connection between NPT and BSPP fittings, with thread sealants recommended for added security. The BSPP connection is typically used in hydraulic systems, offering reliable sealing in fluid and gas transfer applications.