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.
Copper Heater Straps. These are the longer style heater straps. These are the most common heater straps. These heater straps are used to connect power from the PC board and the heater.