Push-Fit Adapter Fitting, Application Air, Fitting Side A Connection Type Push-to-Connect, Fitting Side B Connection Type Tube Stem, Fitting Side A Tube Outer Diameter 1/4 in, Fitting Side B Tube Outer Diameter 5/16 in, Fitting Material Fiberglass-Reinforced Nylon, Material Grade Not Applicable, Color Black, Includes Pre-Applied Thread Sealant Pre-Applied Thread Sealant Not Included, Maximum Operating Pressure 290 psi, Maximum Operating Temperature 176 Degrees F, Overall Length 1 5/8 in