R12 to 134a Low Side Thread Down Coupler #3055

• Thread down couplers are used for hard-to-reach schrader valves
• These couplers are for use with R12 hoses. 

Instructions:

Turn knob counterclockwise to raise depressor valve.  (This makes it easier to install on lowside port)

After coupler has been installed, turn knob clockwise to insert product and read pressure.