A female reducing hex coupling is a precision-engineered pipe fitting designed to connect two female NPT-threaded ports of different sizes. It features female NPT threads on both ends, with one end smaller than the other, and a hexagonal body for easy tightening or removal with a wrench. This fitting allows for size adaptation in piping or instrumentation systems while maintaining a secure, leak-resistant connection.
Female reducing hex couplings are widely used in hydraulic, pneumatic, instrumentation, and fluid systems across industries such as oil and gas, chemical processing, manufacturing, and power generation. When installed with proper thread sealant or PTFE tape, they provide a reliable solution for connecting mismatched NPT ports in high-pressure applications.

