Cap Application Potable Water Fitting Connection Type Compression Fitting Material Brass Fitting Tube Size Outer Diameter 5/16 in Maximum Operating Pressure 300 psi Maximum Operating Temperature 250 Degrees F Specific Fitting Shape Cap System of Measurement Imperial Fitting Thread Size 1/2-20 Standards NSF/ANSI 61 Annex G Compatible Tube Material Aluminum Copper Thermoplastic Minimum Operating Temperature 65 Degrees F