Back Ferrule Finish/Coating Colorless Dry Lubricant Fitting Material Brass Maximum Operating Pressure 3 500 psi Maximum Operating Temperature 400 Degrees F Specific Fitting Shape Back Ferrule Compatible Fitting Brands Swagelok Compatible Tube Outer Diameter 3/16 in Series A-LOK(R) Standards ASTM 31.3 Compatible Fitting Connection Type Compression Minimum Operating Temperature 40 Degrees F