The Respond C5 Pneumatic Conserver is a single lumen conserver with multiple continuous flows. It is dual functional with six flow positions in the conserve mode and three in continuous mode making it a a conserver that is flexible, lightweight and easy to use. A true 5 to 1 savings over continuous flow with a .14-inch activation. It is lightweight, 14.8 ounces and compact. Uses a standard single lumen cannula.