Product review (5 stars): Good for an entry level water filter
This is a great basoc water filter system, HOWEVER this exact item is the filter and the part that the filter snaps into allowing the water to flow through.  This top part occassionaly goes bad, this is why I bought it.  If yours goes bad you can tell by the low water flow/pressure or it causes your cold water hose/pipes to shake.  I replaced my worn out unit and it works much better.