[rikyBsharpe]

Would a kitchen sink drain, that is not hooked to a sewer line or septic tank, need a vent pipe? IE, cabin in the middle of nowhere, and want to drain into woods behind cabin.

[speedball1]

If you trapped it you should have some kind of a vent on it and if you didn't trap it you would have made a direct pathway for bugs and little crawly critters to enter your cabin. Having said that, if all you're going to put down the sink is water I guess you could just pipe it out in the boonies and screen the end. Good luck, Tom

[rikyBsharpe]

If you trapped it you should have some kind of a vent on it and if you didn't trap it you would have made a direct pathway for bugs and little crawly critters to enter your cabin. Having said that, if all you're going to put down the sink is water I guess you could just pipe it out in the boonies and screen the end. Good luck, Tom

Thanks Tom for the answer. I was planning on using a p trap. The sink is in the middle of the room, not near a wall. Any suggestions? Why do I need the vent?

[speedball1]

Why do I need the vent?

You don't really need it just as you don't really need a trap. However, a vent will allow it to drain better since a vent relieves the suction set up by the draining water. Will you be installing a dry well or simply letting it discharge in the woods? What are you doing for solid waste? Tom

[massplumber2008]

In addition to Tom's answer you could just use a mechanical vent (called an AAV)... see images. This would go under the sink at least 6 inches above the PTRAP... ;)

The last image shows a quick transition from galvanized pipe to PVC pipe.