A latch mechanism includes a latching member, a push member, and a sliding member. The present invention further provides for a system for the controlled storage and dispensing of a hazardous material at sub-atmospheric pressure that comprises a pressurized source vessel and the integrated valve regulator assembly of the present invention. The method then determines the appropriate increase in zone air pressure to achieve the optimal zone air pressure for the patient. The spatial position of the finger relative to the screen is detected, i.