The 2 inch Pump Split Nut is used as a replacement for the pump union that would need to be re-plumbed. You can cut off the old pump union and replace with this split nut. This comes with the 2 screws that screw and hold it together.
SpaBoss X-It makes it easy to switch sanitizers or to lower excessively high levels of chlorine or bromine in your spa or hot tub without having to drain and refill the whole thing.