I am plumbing an "outdoor" kitchen with a sink. The kitchen area is actually a covered space a the end of an attached 24x34' garage with large roll up door for patio access. I have access to water supplies, but no easy access to a gravity drain for the sink. I purchased a laundry tray pump system to send the sink water overhead to the main house plumbing drain system (all in conditioned space).

My question:

1. Does the vent for this type of pump (sink and possibly condensate from an A/C unit)need to be run through the roof or can I tie into the main house vent stack? I think sewage ejectors need a seperate dedicated vent, but I'm guessing this is different.

Installation instructions:

http://www.zoeller.com/zcopump/zcopdfdocs/FM2182.pdf

Thanks for any help on this.