Nut, Application Potable Water, Fitting Thread Size 5/8-18, Flare Angle 45 Degrees , Fitting Material Brass, Hex Size 3/4 in, Maximum Operating Pressure 1,000 psi, Maximum Operating Temperature 250 Degrees F, Overall Length 3/4 in, Specific Fitting Shape Nut, Compatible Auto Systems Domestic, Compatible Tube Outer Diameter 1/4 in, Standards NSF/ANSI 61 Annex G, Compatible Tube Material Aluminum, Copper, Thermoplastic, Fitting Connection Type Flared, Minimum Operating Temperature 65 Degrees F