i am currently in the process of finishing my basement- i had the rough in for the bathroom done when i built the house.
Toilet and shower are obvious - but i have two 2" PVC pipes coming up side by side - one is the sink and the other the vent. How can i tell them apart.
I took a flash light and shined it down each and stuck my head in the pump pit.
PVC1 seemed to enter the main line from above about 18 inches away from the pit. (bright light shining down from above.)
PVC2 i could see a dim glow entering the main line also about 18 inches back but coming in from the side.
which is the vent ???