Bill, This is perfect, and I just learned a valuable lesson on how to properly search for a topic. I went back only two years which yielded absolutely nothing. With the information you provided I should now be able to weigh my decision on noise and include efficiency since both pumps run much quieter than I anticipated. The Gast website had me worried when they listed <70 DB for their 1/4 and 3/4 HP pumps and I had nothing to compare to verses Rocking Piston. And definitely I will provide sound proof material in the cabinet. I appreciate the reply.