I recently installed a new sink (including all plumbing) in basement. It leaks where the PVC drain pipe connects to the pipe that comes out of the wall. I bought a new nut and washer just to make sure that wasn't the issue. It still leaks. I'm not a plumber, so there may be something very obvious that I'm missing. It seems odd to me that there is not something a little tighter in this spot to prevent leaks. I feel like I could pull the pipe out of the washer if I pulled hard enough. I'm attaching pictures. Any help would be greatly appreciated. Thank you.