Product review (5 stars): Better design
I used Pureline in the past but unfortunately could not find on Amazon in the quantity desired. Therefore, I purchased another brand in Dec. for my daughter's refrigerator and my own.  My daughter installed her unit in Dec with no problems.  I delayed installing in my refrig until March.  The unit installed okay with no apparent problems.  However, it leaked about a gallon of water into the refrigerator compartment in a couple of hours.  Fortunately, we were only out of the house for 2 hours!!!! I tried to make it stop leaking but could not.  I could not return as Amazon stated the return window had closed.  I ordered a single Pureline unit.  The Pureline unit has 2 O-rings where the other has one.  The Pureline unit is slightly harder to insert and remove because of the second O-ring, BUT I would not want to give up the extra protection.  I would rather have a unit that will not leak rather than a unit that 1 out of 2 leak.  I will continue to buy Pureline in the future.