The 316 -12 Female O-Ring Boss x 3/4" Male National Pipe Thread is a hydraulic fitting designed to connect a female O-Ring Boss (ORB) port to a male National Pipe Taper Fuel (NPTF) threaded connection. It provides a secure, leak-resistant seal using an O-ring on the ORB side and a tapered metal-to-metal seal on the NPTF side, making it suitable for high-pressure hydraulic and fluid transfer applications. Typically manufactured from durable materials such as carbon steel, stainless steel, or brass for strength and corrosion resistance.