Threaded to Tube Connector Orifice Fittings are commonly inserted into threaded ports in manifolds, cylinders or blocks. RB82548 is 316 stainless steel and comes with either a viton or buna seal ring. This fitting is 10-32 thread and connects to 1/16" ID flexible tubing. RB82548 comes with the sharp edge ruby orifice series in sizes from 0.0004" thru 0.035".