1/4" MNPT A style push button safety couplers are easy to use. Simply push once to stop airflow, twice to release plug. Safety couplers prevent possible injury or damage due to accidental disconnects. OSHA required in certain areas and applications. A style safety couplers have a 1/4" basic flow size, Maximum inlet pressure of 300 PSI and air flow of 36 SCFM.
Abbott Rubber Technical Data Sheet