Tube End Reducer, Fitting Side A Connection Type Compression, Fitting Side B Connection Type Compression, Fitting Material Stainless Steel, Fitting Side A Tube Outer Diameter 1/4 in, Fitting Side B Tube Outer Diameter 3/8 in, Material Grade 316, Maximum Operating Pressure 6,600 psi, Maximum Operating Temperature 1,200 Degrees F, Overall Length 1 5/8 in, Specific Fitting Shape Straight Adapter, Compatible Fitting Brands CPI, Thread Size A 7/16-20, Thread Size B 9/16-20, Series CPI(TM)