When I installed this part on my 2001 Chevy Cavalier, I noticed that the threaded and unthreaded ends fit together with no problem or difficulty. I use tape on the threaded ends to prevent leaks. I also changed the transmission oil and filter because it had over 100,000 miles on it. I drove the car more than 200 km on the Autobahn. As a result, there were no leaks or material defects. I am very proud to have chosen this product!