Mazda RX-8 Workshop Manual page 1081

NOTE:
The quick release connector can be removed by pushing the center of the retainer tabs.
The retainer is attached to the evaporative pipe even after the connector is disconnected.
2. Hold the center of the retainer tabs with the SST ends and press the retainer.
3. Pull the connector side and disconnect the quick release connector.
4. Raise a retainer tab using the SST and remove the retainer.