A device for controlling delivery of a fluid to a patient is disclosed having an injector device having a cylindrical body and a plunger having a head having a valve, the valve capable of opening and closing, the plunger for insertion into the cylindrical body of the injector device. A device for controlling delivery of a fluid to a patient is also disclosed having an inlet end, an outlet end, a side having a portion of elastic material, the elastic material capable of expanding or contracting with the device for insertion between an injector device and a manifold or an injector device and a catheter.
