This product often applies to auto remove the seeper at the lower places of piping ,frozen type air drying machine ,oil separator ,air storage tanks and the bottom of various air filters. It can be installed in the places inconvenient for manual discharge of sewage .such as higer ,lower and narrow places ,especially there is consumption of air of frequent water drains.It can prevent the compressed aie being repolluted by condense water resullting from neglect of manual drain.