Nut Application Potable Water Finish/Coating Nickel-Plated Fitting Material Brass Maximum Operating Pressure 200 psi Maximum Operating Temperature 250 Degrees F Overall Length 1/2 in Thread Size 5/8-18 Specific Fitting Shape Nut System of Measurement Imperial Compatible Tube Outer Diameter 3/8 in Standards NSF 61 Annex G Fitting Connection Type Compression Minimum Operating Temperature 65 Degrees F