The nitrogen regulator assembly 19-352-03 is used to supply nitrogen to the flush tank assembly 19-352-01 to pressurize the flushing system. In addition, the nitrogen regulator assembly 19-352-03 will be used to purge the a/c components of solvent when the flushing procedure is completed. Hose is 6ft long. Part of kit 19-000-01 & 19-000-02.