Product review (1 stars): Don't believe the compatibility claims
Claims that it is "Compatible with WHIRLPOOL 4392857".  IT IS NOT COMPATIBLE WITH THE WHIRLPOOL 4392857 FILTER!  This cheap knockoff won't even screw into the refrigerator.  Now I am stuck with 2 of them, since it is past the return for refund date.  Not happy with Onepurify or Amazon.