Face Seal Threaded Orifice Fittings enable the designer to thread into a port and seal against the face of the manifold or block . RB82616 comes in brass . RB82616 has a 2-56 thread and 1/8" hex. The orifice is typically mounted in the hex end, but can also be mounted in the thread end as a non standard part if needed. This part comes with our sharp edge ruby orifice series in sizes 0.0004" thru 0.035". Nickel flash plating for enhanced corrosion resistance is extra.