Easy install for a quick swap out. The knob that keeps the two pieces together had broken on one of my toilets and I couldn’t figure out why the under piece was sliding around and at times not lined up to flush. After looking at another toilet in the house, I could see that there was a missing piece. Once I found the part on the website, it arrived quickly and was able to be installed in a few minutes. FYI the two arms are adjustable and will need to be shortened by twisting if your tank continues to run.