2-1/2-12 Male O-Ring x 2 Female National Pipe Straight Mechanical AdapterThe 2 1 2 12 Male O Ring x 2 Female National Pipe Straight Mechanical Adapter is a high performance hydraulic fitting designed to connect male O ring boss threads to female NPSM threads. This adapter provides a secure, leak resistant connection in high pressure fluid, hydraulic, and industrial applications. Specification Value TYPE Male O Ring x Female National Pipe Straight Mechanical Adapter DESIGN Leak Free Design, O Ring ensures a tight and high