Hi-Flow brass air brake fittings are used in conjuction wth reinforced nylon air brake tubing NT100 - SAE J844 Type A and B.  Typical application:  air brake systems except where temperatures exceed +200 degrees Fahrenheit or where battery acid can drip on tubing.  Pressure and vibration:  maximum operating pressure of 150 psi and fair resistance to vibration.  Advantages:  easy to assemble (no tube preparation or flaring required).  Stainless steel tube support standard.  Other applications include lubrication and air controls.  The minimum burst pressure of airbrake tubing is 1,200 psi. Conformance:  Meets SAE 100102ba and DOT FMVSS 571.106 specifications . Tube size is measured by tubing outside diameter (OD)