Low Side Snap R-134a Coupler A/C Quick Disconnect Adapter

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1/4" fitting to connect to R12 gauges
Converts R12 manifold gauge set to 134a gauge set
Attach to blue hose on manifold on low pressure side
Snap coupler down to read pressure, or install refrigerant in system.
If coupler does not fit on fitting, you are connecting it to the high side fitting.  
This fitting will only fit on low side R134a fitting