Union Application Air 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 Pressure 10 000 psi Maximum Operating Temperature 1 200 Degrees F Overall Length 2 1/8 in Specific Fitting Shape Straight Reducing Connector Compatible Fitting Brands CPI Thread Size A 1-20 Thread Size B 3/4-20