Cap Application Gases Oils Fitting Connection Type O-Ring Face Seal Finish/Coating Zinc Nickel Fitting Material Steel Fitting Tube Size Outer Diameter 5/8 in Maximum Operating Pressure 6 000 psi Maximum Operating Temperature 250 Degrees F Specific Fitting Shape Cap System of Measurement Imperial Compatible Fitting Brands Seal-Lok Fitting Thread Size 1-14 Series Seal-Lok Standards SAE J1453 Minimum Operating Temperature 30 Degrees F