Reducing Union Application Gases Liquids Fitting Side A Connection Type Compression Fitting Side B Connection Type Compression Fitting Material Brass Fitting Side A Tube Outer Diameter 1/2 in Fitting Side B Tube Outer Diameter 1/4 in Maximum Operating Temperature 400 Degrees F Overall Length 1 27/32 in Specific Fitting Shape Straight Reducing Connector Compatible Fitting Brands A-LOK Thread Size A 3/4-20 Thread Size B 7/16-20 System of Measurement Imperial