This product often applies to auto remove the seeper at the lower places of piping, frozen type air drying machine oil separator,air storge tanks and the bottom of various air filters,It can be instal led in the places inconvenient for ma-nual discharge of sewage, such as higher,lower and narrow places,especially theres large con-sumption of air of frequent water drains,It can prevent the compressed air being re-polluted by condense water resulting from neglect of manual drain.