Union Application Gas and Fuel Oil Fitting Side A Connection Type Press-Fit Fitting Side B Connection Type FNPT Fitting Material Carbon Steel Fitting Side A Pipe Size 1/2 in Fitting Side B Pipe Size 1/2 in O-Ring Material HNBR Specific Fitting Shape Straight Union Adapter Finish/Coating Zinc Nickel-Plated Overall Length 3 in Maximum Operating Pressure 200 psi Maximum Operating Temperature 250 Degrees F