The Whirlpool 4389178 has been discontinued and replaced by the Whirlpool W10408180 Refrigerator Water Inlet Valve.
The Whirlpool Ice Maker Inlet Water Valve Kit (4389178) is a triple water valve kit used with W10190961 (a 5-cube ice maker kit) in a vertical in-door ice dispenser.
This Whirlpool triple water valve kit (4389178) is used for in the grill filter water valves connected to 5-cube ice makers on Whirlpool, KitchenAid, Kenmore, and other compatible side-by-side refrigerators.
This kit includes a quick connect tube fitting, 10 inches of extra plastic tubing, and detailed installation instructions.
This is a genuine Whirlpool part.