Super Jet Superjet Impeller

I bought a sn hull and it came with a pump. The only make rings on the impeller are E57. It is stainless so I don't think it is stock. I'm just courious what it is.
 
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dfw
They are about the same load as a Skat 15-18 and 10-18. OK for riding fast but doodoo for low speed thrust. Find a Skat 12-17 small hub swirl or a Solas "S" 14-17 or 13-17 concord and bore your nozzle.
 
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