Product review (5 stars): What you are not told when purchasing new Whirlpool refrigerators!
These items are mandatory  every six months if one purchases the Whirlpool French door refrigerators.  the items keep the air in the refrigerator fresh.  This was ordered to comply with the instructions from the manufacturers.  In addition to this item, one must purchase water filters and other items every six months.  Note to the sales people who explain and sell these new refrigerators--please include in your sales pitches that all these items must be purchased every six months in order for the refrigerator to work properly.  The cost for these extra items amount to approximately $60 to $75 every 6 months making the cost of owning these new appliances very expensive!
I have used this product for over a year, and find it easy to insert them, according to directiions from the manufacturer.
M.Moidel