The 10023100CR050 Buttweld Conical Reducer Fitting has 1.0 inch outside diameter with a reduced size 0.5 inch O.D. outlet and 0.065 in. wall thickness. This concentric reducer features high conductance conical profile to reduce the tube size. Series 23 vacuum buttweld fittings are constructed with welded, drawn, and annealed 304 stainless steel tubing for applications where minimizing the number of sealed joints is critical.