Difference between HP10E311-2MS2 and HP10E311-2MS1

[APW]

I think my impeller is coming apart, starting to get little black plastic chunks in my solenoids. My old pump is HP10E311-2MS1 the only one I can find close to it is HP10E311-2MS2. What's the difference?

 

[GoBuckeyes]

Call Dultmeier Sales...they will be able to tell what the difference is. I'm looking at the packing slip of my spare booster for my LW4000 and it is a HP10e311-02MS1. It's 1 HP 3ph 10gpm stainless.