Attached to the end of the push rod is a set of spring-loaded jaws connected by a hinge pin. Jaws are held closed by a tapered or belled flare at the base of the stopper. When the button is ...

The shaft contains the spring-loaded button and a push rod. Attached to the end of the push rod is a set of spring-loaded jaws connected by a hinge pin. Jaws are held closed by a tapered or belled ...