TD720-04 solenoid drains are designed for reliable removal of condensate from compressed air systems. This drain has a 1/2″ BSP inlet connection to the valve.. The TD720-04 can be used in a variety of applications to automatically drain the condensate from dryers, receiver tanks, and filters in compressed air systems. Other voltages are available. For applications not listed or any other technical gas please contact National Filters or your local distributor. Prices Exclude GST.