1-5/16-12 x 1 Male O-Ring Boss x Male National Pipe Thread Straight AdapterThe 1 5 16 12 x 1 Male O Ring Boss x Male National Pipe Thread Straight Adapter is a fitting designed to connect a Male O Ring Boss (MORB) thread with a Male National Pipe Tapered (MNPT) thread. The MORB end incorporates an O ring to ensure a leak proof seal, while the MNPT end features tapered threads that create a tight, secure connection by compression. This straight adapter is primarily used in hydraulic, pneumatic, and fluid transfer systems