HOW TO USE ?
Easy To Operate
1. Counterclockwise switch T knob to retract internal pin
2. Screw the can tap dispenser on R134a can opening and hook it to R134a charging hose parts
3. Clockwise switch T knob until the pin punctures sweet spot of bottle opening
4. Counterclockwise switch T knob, then R134a fill the hose and be charged into air conditioning