I needed to attach several 2 inch exhaust pieces, used a 3/4 inch impact and it worked. However it was very noisy, there had to be another way, adapt Hydraulics. I realized the Lisle kit used the same threads as my Harbor freight 10 ton knockout set. I hooked up the pump and ram and inserted large adapter thread, short end into the ram, I also used the chrome spacer included in the HF kit onto the threaded shaft. I proceeded to put the smallest expander with the square locking nut from the Lisle kit, screwed it down by hand. The pipe must be lubed. Being in the kitchen due to the rain I used canola oil cooking spray on the pipe and threads, plus a dab of EP grease on the threads. Slid the 2 inch pipe on the expander and pumped until it became difficult. Released and turned about 6 to 8 times. You must turn the pipe otherwise a square pipe will result. Perfect results, 2 inch pipe fit into each other without adapters. No compressor or impact gun needed. Made 6 connections. This Lisle kit is heavy duty and would buy again if ever needed.