Need a tool to chase the rust out of threads on irrigation riser sockets.
Thread is 4" NPT internal. Yes---that's FOUR INCH.
Any ideas? I've never personally seen a pipe tap that big, and I'm sure the price would scare me. Might just have to offset the tailstock and make one. I think I've got a chunk of 5" 8620 around here somewhere.
Does anybody have a source for a 4" internal thread chaser?
Bill