Plumbing roof vents, modern vs. old style

[bucolic_frolic]

19. So, I finally plumbed the line with a snake.

Nothing came up with the snake, it was clean as could be. The water flows slightly better, but still a few quick gurgles and then a slight pause and a gulp. It is silent if the volume of water is below about 12 ounces, and if the sink is full it gives massive gurgles and a gulp at the end.

I also cleaned the tub drain. 40 years of clog. Took the whole stopper assembly out. There was a massive hair ball that had become sediient at the bottom, so it had poor flow. Now flow is easily twice what it was.