An impact reset mechanism and method that automatically resets a spray arch in a vehicle washing system to permit operation of the vehicle wash system after the spray arch has broken away from its rigid, operating position due to contact with a vehicle. The structure design can be applied to improve the conventional blister-type packaging container, which has the disadvantage of being easy to open and therefore poses a risk of accidental child ingestion. The axial displacement of the piston radially expands a tubular member into contact with a preexisting tubular member. The patient valve has a one-way valve member through which air flows in passing from the bag to the patient.