Good day, All

I am trying to figure out the venting for my basement bathroom.
I am running a 4" waste drain from the toilet to my sewage holding tank, (one of those inground ones with a pump)which takes a 3" vent.
I will also tie in a shower (2") and a sink (1.5 or 2")to the 4" main drain.
Do i have to vent each individually?
I have an existing 2" dry vent (or wet vent depending where I tie in to it). Not too far away.
Is this sufficient for all three fixtures (toilet, sink and shower) or do I need a larger vent?

Im in Ontario, Canada by the way.

Thanks for your input.

Rob

I will also tie in a shower (2") and a sink (1.5 or 2")to the 4" main drain. Do I have to vent each individually?
Not if you connect the toilet to the main drain and the lavatory drain to the toilet branch and run a vent off the lavatory. The shower wi8ll connect to the lavatory drain line and be wet vented by it. Wet vents are code in 90% of the nation. Check code to see if you're in the excluded 10%.

I have an existing 2" dry vent (or wet vent depending where I tie in to it). Not too far away. Is this sufficient for all three fixtures (toilet, sink and shower) or do I need a larger vent?
Come of the lavatory with 2" and revent back to the existing dry vent and you'll be just fine. Good luck, Tom