venting a grey water tank

[dh]

I have built a "Red Neck holding tank" and need to vent it. I have drilled and tapped the end cap on the dead top to accept a 1/2" NPT thread, and would like to run a PVC tube to vent, but where is a good place to vent to? I don't want to go out the roof, how odorus is a grey water tank? I have considered venting to the sink drain, which would work and be really easy and out of the way, but will odors be an issue?

[eatatjoz]

I haven't really noticed any smells from my gray. I only have a rear differential vent on the top of the tank.
Black water could be an issue, but my sink water never set off any alarms.

[Lookfar]

You could also get a "mini vent". Studor is a brand I remember from being in the wholesale plumbing business. I've seen them used in RV's and shouldn't be hard to find.

[Steve_Cox]

I'd put a loop in it and put it through the floor, it would also be an overflow if the tank gets too full. If you put it in the sink drain it would vent into the inside of the trailer, and that doesn't smell too good.

[dh]

You could also get a "mini vent". Studor is a brand I remember from being in the wholesale plumbing business. I've seen them used in RV's and shouldn't be hard to find.

I looked em up online, cant quiet tell how they work, looks like a one way check valve. I need it to let air out as the tank fills, and back in as the tank drains.

[john]

I did as mentioned above.

I used a flexible tube that ran up above the height if the tank before dropping through the floor.