Do you have pictures available for installed inline vents?

I believe you are talking about an AAV, air admittance valve. Air Admittance Valves (http://www.toolbase.org/Technology-Inventory/Plumbing/air-admittance-valves) Sometimes folks also call them Studor vents since Studor was one of the main manufacturers for a time.

That's right Bob ! He's asking about a AAV, ( air admittance vent, see image). Some areas allow in line vents, some do not. Check with your local Building Department, Good luck, bTom