We have independent test lab reports on file showing that prototype assemblies exceeded D.O.T. recommendations in all categories. The only continuing test program however, is a 4000 P.S.I. hydrostatic pressure test of every hose assembly that we make. We do not claim that any individual hose assembly is certifiable to D.O.T. standards, and we therefore must advise you that they are sold for off-road applications only. We make no claim of usability or suitability for highway or road use. PTFE brake hoses must be installed by an experienced professional mechanic. After installation each hose must be clean and free flowing. There must be no possibility that the installed hose assemblies can be stretched, crimped, or kinked under any conditions of wheel travel and steering angle. As with any hose installation, periodic inspection of hose condition is essential.