R12 to 134a Low Side Professional Snap Coupler - Brass #3045
- 1/4" fitting to connect to R12 gauges
- Converts R12 manifold gauge set to 134a gauge set
- Attach to blue hose on manifold, insert on low pressure side (Big Line)
- 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
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