• 1234yf Low-Pressure Coupler. 10Bar Nitrogen Regulator testing kit for automotive air conditioning systems. • R134a Low-Pressure Coupler. (N2H2) 95% Nitrogen 5% Hydrogen. The probe of a sniffer can even be positioned inside a car's dashboard vent to detect the presence of Hydrogen or along the top of the dashboard near the windscreen area giving a clear indication of an unseen leak within the evaporator area.
