I am insalling a lift sation on a one bedroom cabin. 3in intake with 2in discharge . Do I vent where it goes into the lift or the 2in dischrge out to the septic tank.
Thank you Luis

YES! To both vents! This is a ejector pit set up. You vent the fixtures in the usual way through the lavatory and run another separate dedicated vent off the ejector pit. The two vents MUST reman separated and CAN'T be merged. Good luck, Tom