Well, I went back after I had lunch and a miracle! It stopped leaking, I guess the cartridge had teething pains. Anyway, it works and I am very happy. I was worried about tightening the screws on the brass flange. If you tighten one too tight you can put extra pressure on the side and it will be out of alignment and put a kink in the gasket or o-ring. I was very careful to torque the screws equally and everything is fine. I never thought I would be doing repairs at 68. I started my apprenticeship when I was 15 years old. The photo is of the old cartridge. I took the photo with me to the plumbing shop to make sure I got the correct replacement.