The Adaptall Series 7033 Straight Male NPT x Female BSPP rigid hydraulic adapters, made from carbon steel, are designed to connect pipes in hydraulic systems for fluid and gas transfer. NPT (National Pipe Taper) connections use tapered threads to create a tight, leak-proof seal by causing the threads to deform and form a metal-to-metal seal. This type of connection is ideal for permanent installations but is not recommended for frequent assembly and disassembly due to wear on the threads. BSPP (British Standard Pipe Parallel) connections use parallel threads, with a sealing method that involves metal-to-metal contact or a combination of metal-to-metal and O-rings, ensuring a secure connection. These adapters allow for the joining of NPT and BSPP fittings, providing durable and efficient sealing in hydraulic systems. Thread sealants are often recommended for BSPP connections to ensure a reliable seal.