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Rich, I have very little room for the lines, so running with one is my preferred option.

Looking at the #21230, with the pump it looks like there are 3 pump inlet possibilities ...and if you count the front one on the block 4..!!?

Does this mean you can use ANY one inlet and just plug the others off?



In theory, yes. But you should look at the pump's impeller and use the inlet that obviously has the least restriction. This is usually the inlet that comes in from the side of the cover just like Andy's.