GAV SAFETY QUICK COUPLER 1/2 M TWO STAGE RELEASE GAV AB-3Airblock Safety Quick Coupler Airblock is designed to first shut off the air and then open to release the coupler connection. A true safety feature Excellent airflow characteristics Universal type coupling Patented design Made in Italy 1 2 inch male BSP thread The air flow freely through the coupler Push release backwards. The flow of air is cut and the pressure is vented. The coupler is released from the connection The British Standard Pipe (BSP) is