I’ve been researching various manufacturers and models of sump pumps, as I am seeking the *quietest *model available. I already know that a submersible pump that is fully sealed with a good check valve helps minimize noise. Supposedly the two best for noise reduction are the Red Lion (very popular in Canada) and the Zoeller pump. I have not been able to determine what makes these two so special. One Red Lion pump owner claims that he can only hear water in the lines and nothing else.