Pivoting safety coupling NW 7.4 with external thread Design: With free passage. The housing is made of steel with NBR seals. The plug nipple is pushed in the body of the coupling and the connection is established by moving it approx. 90°. A secure connection is established as soon as the red ring locks into the groove. In order to release the connection, the red ring needs to be pulled back and the plug nipple pivoted to the stop in the starting position. A vent hole on the rear of the coupling provides ventilation during decoupling. These couplings conform to ISO Standard DIN EN ISO 4414, EN 983. Application: For pneumatics, machinery and plant construction, process measuring and control technology, manufacturing industry, workshops, automative. Note: This safety coupling is not suitable for direct installation on pulsating tools.