The LeakTamer™ Plus EVAP Smoke Machine by OTC is a versatile, diagnostic, one-button tester built to specifically test and repair OBD-II EVAP system leaks while operating in accordance with major automakers' EVAP testing specifications and needs. The OTC 6521’s state of the art electronics precisely controls the critical pressure and flow rates needed for testing today’s advanced EVAP systems. Introduce the non-toxic vapor with its patented UltraTraceUV® dye technology into the system being tested and the machine automatically confirms the existence of excessive leakage. UltraTraceUV® is the only dye solution available on the market today that is OEM EVAP-approved.