Unless your other one is free, DON'T BUY IT!
This pump has been plagued since day one and the forums are covered with people who have had and replaced them more than once, including me. It's apparently core design flaw that they have tried to redesign at least once without success.
I blew my second one last week, flooding a storage bay, after only 2 occasional use years and the factory is replacing it with a completely new model for free. They too have given up on the entire 5.7 line. Out of production, and no service.