The Airflow Coupling is the original quick-release coupling with over 60 years of design enhancements; manufactured in the UK to the highest standards. The sleek silver Airflow Couplings are manufactured using hardened steel with a hard, corrosive and scratch-resistant finish, ensuring extra durability. Ideal for use in the engineering/workshop environment. PCL Airflow couplings are designed for FIXED applications. Compatible with the Standard Adaptor range, Steel Construction - robust and hardwearing, ideal for use in the engineering/workshop environment, Positive locking mechanism. Nominal Bore: 4.8 mm, Maximum Flow Rate: 43d. The 'Industry Standard' coupling, these tailpieces are manufactured from high-quality Sheffield steel. For use with air tools, garage, industrial airline supplies and test panels. The BSP products are designed for single-action fixed applications and are compatible with standard adaptors. Complete with a quick-release action and positive locking mechanism to prevent accidental disconnection. Features and Benefits: Compatible with standard adaptors, Positive locking mechanism ensures a firm hold for optimum airflow, Available in varying sizes to suit your requirements, Steel construction makes for a durable product, Quick release allows you to easily remove the coupling when desired. Typical Applications: Automotive, Workshops.