Product review (5 stars): Works with Whirlpool Model: ET21LKXHW00 (top freezer)
The picture by "Buy-it-now-store" shows water valve Part#: 4318047 (which is exactly what I uninstalled from my Whirlpool fridge; see my pictures above or search for the video on youtube "Refrigerator Water Valve Repair Refrigerator Repair Help") but they sent me the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Whirlpool-2315576-Valve-Inlet-for-Refrigerator/dp/B004XLEEKO/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Whirlpool 2315576 Valve-Inlet for Refrigerator</a>.

Before getting upset I decided first to give it a try and... it worked. So, I didn't complain to the seller; their price was much lower ($18.21) than the Whirlpool's. It turned out to be a win-win situation for everybody.

Apparently Whirplool replaced some time in 2003 the old 4318047 with newer 2315576 because along with the installation instructions for the 4318047 (5/98) there was an insert from the company for the "Quick-Connect Single Water Valve" (6/03) explaining what to do in case I received either valve. I also got a small bag of add ons for the old valve. So, the two valves are interchangable and compatible with many refregirator models.

Still, in order to get a better idea on how to work with the new valve, I found and watched the video on youtube, which made the installation process a breeze [search for "Refrigerator Repair - Replacing the Water Inlet Valve (Whirlpool Part# 4389177)"]. Enjoy the new valve :).