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**Doby** · 01-21-2008, 07:33 PM

All drain lines need a vent, this is usually located off the main line and vents thru the roof. If the kitchen sink is connected to the main sewer line in the house this line would have to be vented otherwise the toilet would not flush properly. On rare occasions gray water(sink water) is not connected to the main sewer so check that out.

Bottom line is,,,,,,,, if the plumbing is up to code that vent is not needed

01-21-2008, 07:33 PM	#2 (permalink)
Doby Moderator Hardware Team Join Date: Jan 2006 Location: Central PA (USA) Posts: 6,996 OS: XP sp2/ Vista	Re: Dishwasher vent/air gap All drain lines need a vent, this is usually located off the main line and vents thru the roof. If the kitchen sink is connected to the main sewer line in the house this line would have to be vented otherwise the toilet would not flush properly. On rare occasions gray water(sink water) is not connected to the main sewer so check that out. Bottom line is,,,,,,,, if the plumbing is up to code that vent is not needed __________________ Would you like to help TSF fight cancer and other diseases??? JOIN TEAM TSF