Nut and Spacer Set Application Air Fitting Material Polypropylene Maximum Operating Pressure 300 psi Maximum Operating Temperature 212 Degrees F Specific Fitting Shape Nut and Spacer Compatible Tube Outer Diameter 1/4 in Series Fast Tite Standards FDA Approved NSF/ANSI 51 Color Black Compatible Tube Material Thermoplastic Fitting Connection Type Compression Minimum Operating Temperature 0 Degrees F