Whirlpool 4396508 and 4396510 are now EveryDrop EDR5RXD1 (Filter 5) Ice and Water Refrigerator Filter

Installation Guide

whirlpool-everydrop-series-installation-guide.pdf

Instructions

Note: Filter must be pushed firmly into receiver and turned until filter is locked in place. If filter is not locked correctly, water will not flow.
DO NOT use any tools to install this filter
Twist the old filter a quarter-turn counterclockwise
Pull the filter straight down and discard (don't worry, the water will shut off automatically)
Remove the reusable color-keyed knob from the end
Discard the old filter
Slide the knob onto the end of the new filter
Push the new filter into the fridge until it stops and twist the filter a quarter-turn clockwise, and reset your change filter light (if your fridge has one)
Flush filter with 3-4 gallons of with water until water runs clear. Some noise is not uncommon as air is purged from the system.
If filter sets for several days without use, flush a quart of water through the filter to remove stale water from refrigerator water lines

Reset Instructions

Press the light switch (the one that the refrigerator door presses every time you close the door) 5 times within 10 seconds or if the fridge has a filter button, press and hold it for 5-10 seconds