The LAV-3000 is designed as a reliable, efficient, and effective large animal ventilator that readily connects to any existing anesthesia machine by removing the reservoir bag and connecting the interface hose in its place. The bellows of the LAV-3000 will now replace the function of the reservoir bag and act as a sensing device for the modified Mark 7 Servo. Just like all of the other anesthesia equipment and ventilators manufactured by JD Medical, the LAV-3000 does not require any electric power. This means that not only is the machine a more environmentally-conscious choice, but the machine is also not bound by electrical outlets or power cords and when used with the optional E-cylinder mounting bracket, the LAV-3000 can be used almost anywhere. The LAV-3000 allows the clinician to fully ventilate the patient. The ventilator is a pneumatic device that automatically pressurizes the space between the bellows and the canister forcing the bellows in an upward motion delivering anesthetic gases from the bellows through the interface hose.