Speedaire auto drain valvesare designed for draining the oil and condensed water from moisture separators, filters, aftercoolers, dryers and air receiver tanks. These Speedaire auto drain valves come equipped with an adjustable electronic timer for automatic opening & closing of valves. Speedaire auto drain valves feature filter ball valves for controlling the high-pressure flow rates and reducing the frictional losses. Models from 38X Series of these Speedaire auto drain valves, such as 38XT33 and 38XR59 can handle temperatures ranging from 35 to 95 degrees F and models from the 13X Series, such as 13X524, 13X525, 13X526 and 13X528 have an operating temperature range between 14 and 140 degrees F.