Many years ago I worked as a plumber's helper in Oakhurst Ca.. One week my plumber and I worked at this old timers house on the edge of town for a total repiping of his main sewer line. He was a jolly old guy and had lots of WWII stories and was constantly making us take breaks so we could chat and drink ice tea.

the exhaust port is in the wrong spot.

Loki's trickery strikes again!