1-1/2 National Standard Thread x 1-1/2 National Pipe Thread SwivelThe 1 1 2 National Standard Thread x 1 1 2 National Pipe Thread Swivel Adapter is a threaded coupling designed to connect a Male NST (National Standard Thread Fire Hose Thread) to a Female NPT (National Pipe Tapered) fitting. The swivel feature allows for easy connection without needing to rotate the entire hose or fitting. It is commonly used in fire protection systems, municipal water supply, industrial applications, and plumbing systems.