First foray into stainless steel

Come to think of it, that looks like a magdrive pump. The motor doesn't have a shaft does it? In which case your impeller is magnetic and is driven by a magnet in the end of the motor. This does away with a mechanical seal and prevents potential leaks.
But it also means that the impeller position must be set to maximise efficiency and must be free enough to be spun by the magnet. Therefore there is very little clamping force by the nut and a teflon washer either side of the impeller would be better at minimising friction than a ss one.
 
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Yes, you are correct. This is a magdrive pump. The only seal is the large O-ring between the housing and the SS shield.

The manufacturer specs the washer minimum and maximum thickness stating too thick could be an issue and cause binding.
 
I knew it. As long as the impeller spins freely and doesn't contact the housing you're good. This also means that your impeller is magnetic. Probably one of the 400 series stainless steels. It also means that you can use plastics for washers to support the impeller. Use any that don't swell appreciably or react with wort.
Keep up the good work.
 
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