Connect Sink Directly to Portable Wastewater Tank

Go to Lowe's or HD. They's have all but the part the hose connects to. Be sure to use a p-trap and a "Studor Vent".

jdc1 wrote:
Go to Lowe's or HD. They's have all but the part the hose connects to. Be sure to use a p-trap and a "Studor Vent".

Thanks for the quick response. I'm always up for a trip to Lowes. You think if I tell them what I'm doing, they'll get me the right parts? Do I really need a P-trap if there are no issues with gas/methane coming up from the tank? I would expect dirt, soap, and water are all that will go down the sink drain.

You will get smells up through the sink area. Is the holding tank going inside or outside the camper?

A simply item like this is commonly used for a direct connection to tank using a hose. If it all runs downhill you do not need a trap.

Evacuation Drain Port

If you are using a hose outside, its easy enough to just loop it also. That can be done inside also.

nc_beagle wrote:
Thanks for the quick response. I'm always up for a trip to Lowes. You think if I tell them what I'm doing, they'll get me the right parts? Do I really need a P-trap if there are no issues with gas/methane coming up from the tank? I would expect dirt, soap, and water are all that will go down the sink drain.

Gray water often smells worse than Black water. You do want a P-trap. It could be as simple as putting a loop in the hose but then you have to remember.

Where do you plan to camp? I know people who do this and I don't have an issue with it but it likely violates the rules at a lot of campgrounds.

Thanks everyone!

Let me elaborate. These would just be 1-2 night trips and the holding tank is right beneath the sink, inside the camper. I'd take it out when I get home and empty it. I do trail races that are sometimes far enough away to require staying overnight. It would be for use at the races. It would mostly be used at night.

I don't mind putting the p-trap in if it's useful. Just didn't want to if it isn't. I'm just not sure if I'll have enough room to use a pipe like I linked to in addition to plumbing in a trap. I probably only have 18" (maybe?) between the bottom of the sink and the grey water container.

I would not put it inside while rig is in use. Route it to the exterior, then put in the rig while traveling. Note the big cap has hose connection. the port I posted earlier would allow for connection.
Yes, you could put it inside as long as the garden hose connection is tight. You may get some fumes!
Tote-N-stor

What is the sink? Does it have a kitchen size opening for drain?

P trap for cargo camper

This will keep odors out. If gone on ebay, for those reading a few months late, use "JR Products Exterior Drain Trap RV Camper Concession Sinks" for search terms and it will come up.

You can use a flexible hose to route to your exit. A hose works, but a hose will kink, so get that plastic spiral hose which will not kink.

I just run mine out a hole in the floor to the ground. If you are racing you are in fields? No one will know, or care. If you want to collect it just put a bucket outside under the hose.

You can also route it to a bucket inside and under the sink. Or a portable 5 gallon fresh water tank, just cut a hole big enough for the hose to fit through in the containers's fill lid. Maybe a new lid with no hole for travel. A water bag also work, anything almost will work to catch sink water.

2 days of sink water will not be a bad smell, especially if it is not in an airtight container. It won't smell good, but ...

Not a big deal at all. My Coleman pop-up had the sink connected to an external garden hose connection. I Connected to a waste tote with a 6' hose and camped five years with this feature. No issues, none.