Compression Fitting Union, Application Gases, Liquids, Fitting Side A Connection Type Compression, Fitting Side B Connection Type Compression, Fitting Material Stainless Steel, Fitting Side A Tube Outer Diameter 3/4 in, Fitting Side B Tube Outer Diameter 1/2 in, Material Grade 316, Maximum Operating Temperature 649 Degrees C, Overall Length 2 1/8 in, Specific Fitting Shape Straight Reducing Connector, Compatible Fitting Brands Parker A-LOK, Thread Size A 1-20, Thread Size B 3/4-20. This item has been restricted from sale in the following state (s): []