DMF Series is an aluminum Flow Control Valve for air and oil. Its maximum working pressure is 250 psi, and its temperature range is -40ºF to 250ºF. Also, the sizes available are 1/4-28 Male/Female and 1/8", 1/4", 3/8", and 1/2" Female NPT. These valves control flow in one direction and allow free flow in the opposite direction.