I am putting a bathroom in my basement and have overhead sewers. I am installing a sewage pit with ejector pump. Can the pit be vented into the houses existing vent? Do I have to vent the toilet and shower separately? They are both less than 5 feet from the pit.

Can the pit be vented into the houses existing vent? If you're installing a Saniflow system the answer's yes. Other systems mandate a dedicated vent.

Do I have to vent the toilet and shower separately Not if wet vents, (see image) are allowed in your area. Check with your local Building Department to find out. Good luck. Tom