Hayworth Multiport valve repair vs. replacement

I am so aggravated. I waited over 2 weeks for the parts to come in. I picked them up yesterday and put everything together today and exactly what Demegrad9 warned me about, happened. I was tightening one of the screws and the bottom assembly cracked. GRRRR. So now I have to replace the entire thing. Do I have to do anything special to remove the valve or do I just get a giant wrench and go to town on it?
 
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