Product review (1 stars): This part does not fit the Model # WM2688HNMA washer ...
This part does not fit the Model # WM2688HNMA washer, even though Amazon says it does.  This only has 3 water outlets, where my machine has 4.  So, I bought this, went to install it, and it wasn't the correct one.  I subsequently returned it, and bought this one, LG 5220FR2008F (https://www.amazon.com/gp/product/B071WXFJ2M/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1) which is the correct valve for my washer.

So, you may want to open up your machine first, and see if it has 3 or 4 valves, prior to purchasing this.