I have a Pentair Whisperflo 1hp model WFE-4 part number 011513 that is roughly 10 years old. I have a brand new pump of the same model. The old pump engine is shot. I am looking for the easiest way to swap the pumps out. It appears the plumbing will match up, but I will probably have to cut and replace some of it to perform the swap? My other question is, can I just remove the housing on the old pump (looks like 6 bolts) and bolt up the new one to avoid messing with any of the plumbing? Is it that simple? Just six bolts?