Review on 203-237 Compression Swing Valve by Legend by Jake Pavelko

I've looked on various websites but 1. The picture only shows one side of the valve. The flat side is not shown. They should have had a photo of the valve with the flat side. 2. The part number on the valve itself is "S614" but for some reason the Revain description lists a different part number, "203-237". I have two Legend check valves on two drain pumps in my basement and they are both marked S614 - which is what you get when you order this check valve. Replacing this valve is simple and straightforward - much better than any other valve.