I am purchasing an Intelliflo3 VSF pump model #011078, and I am wondering what type of quality is the shaft seal that comes with the pump? I know a quality shaft seal is very important for the longevity of a pump, so I am wondering if I need to upgrade the shaft seal upon receiving it? I would put the shaft seal PS-201V-CMS in the pump if I need to upgrade it, or does the pump already come with a high quality seal?