3 National Pipe Thread x 2-1/2 National Standard Thread Hose NippleThe 3 National Pipe Thread x 2 1 2 National Standard Thread Hose Nipple is a precision machined adapter designed to transition between NPT and National Standard Thread connections. Constructed from high quality brass or steel, this hose nipple provides a secure, leak free connection for fire hoses, industrial piping, and municipal water systems. Specification Details TYPE National Standard Thread Hose Nipple DESIGN Dual Thread Design for converting