Called a Reducer. Goes from 1 size to another.little bit of a noob here and i want to install a SWG myself but will need to reconfigure my plumbing a bit to fit it in and dont know what this plumbing part is.
What is this fitting inside of the tee where my booster pump attaches called?
Likely yes (given the hex head on the insert).i can see that its 2" down to 3/4" - would the inside be threaded?