Easy-fit filter device for a water purifier

A filter device for a water purifier, comprising:

• a filter unit having a flange in which an inlet, an outlet, and a discharge port extend vertically, the flange having opposite engaging protrusions on its outer circumference and opposite engaging recesses in its upper portion;
• a connecting member fitted into the flange at its lower portion and connected with the inlet, the outlet, and the discharge port and having inner communicating passages bent like an inverted L shape to connect with respective connecting holes in a circumference;
• a cap member fitted around the flange to cover the connecting member and having on an outer circumference connecting ports communicating with the respective connecting holes, the cap member having opposite engaging holes corresponding to the engaging protrusions and opposite engaging grooves corresponding to the engaging recesses;
• and
• a fixing member engaging on an inner end with the engaging recess through the engaging groove.