PCL Airflow 8mm (5/16") Hose Tail Coupling Connector – AC21S. • 1 × PCL AC21S Airflow Hose Tail Coupling (8mm / 5/16"). ThePCL Airflow AC21S Hose Tail Coupling is part of PCL’s renownedAirflow Series — the original quick-release coupling trusted by professionals for over 70 years.
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