1-1/2 inch tubular fits into schedule 40 but not into schedule 80.I'm going to us a sch 80 nipple for a similar project soon.
So what are you connecting to? A square of some size such as 0.840 inch?While I'm waiting for it to arrive, another stupid question comes to mind. What can I use to hold the thing? I'll be damned if i can find even a picture of the end you hold it with while using it. ha! I have socket sets in every size, including 1/2 and 3/4 drive...but i'm guessing i'm going to need a wrench specific to this large tap?
1.Locking pliers as MACPLUMB suggested
2.12-point socket of some unknown size maybe an inch or so?? Your big sockets are probably 6-point.
Be careful to not cross-thread.