Poop in outside sink

[kmdiddy]

I have a 2015 Keystone Laredo with an outside sink. I have owned the rig for 3 years. I took it out for the first trip of the season and after towing it seems that I am getting black water tank contents coming into the outside kitchen sink. I understand its fairly common for there to be a sink plumbed to the black water tank.

My thought is that my waterless trap has gone bad and is allowing black water to come back into the sink. Luckily it has remained in the sink and not come out all over the kitchen. It makes for a pretty terrible smell in the camper when we get to our destination. I have also now noticed a foul smell coming from the sink even when not in tow.

Is this a common failure? Any recommendations on a better waterless trap?

[kellem]

Wow, 35 years of RVing and had no idea a sink of any kind was tied into a sh** tank....how naive is that?

[Huntindog]

Fidel Gastro wrote:

cougar28 wrote:
I don't ever recall any sink being plumbed into a black water tank on a rv. Either something else is happening or it plumbed wrong.

It's done on some floorplans with outside kitchens either because it was required to be done or the builder took the cheap route. In the case of Keystone RV they always take the cheap route and have always done so. This is one sheety situation is it not lol?

When it comes to RVs,,,, the rule is, "there are no rules."
From the factory my kitchen sink drained into the 1/2 bath black tank.

I added a seperate grey tank for the kitchen sink

[Fidel_Gastro]

cougar28 wrote:
I don't ever recall any sink being plumbed into a black water tank on a rv. Either something else is happening or it plumbed wrong.

It's done on some floorplans with outside kitchens either because it was required to be done or the builder took the cheap route. In the case of Keystone RV they always take the cheap route and have always done so. This is one sheety situation is it not lol?

[Grit_dog]

Some of y’all are just insufferable….
Or refuse to read. Not sure which

[Bobbo]

kellem wrote:
Highly doubt a sink is tied into black tank, no way.
What your experiencing is hot temps and grey tank is extinguishing odor.
Our grey tank is just as pungent as black tank during hot months.

Just dump a cup of bleach into kitchen sink and let it slosh around during travel......we've found it's always the dish water vs shower water incase you have 2 gray tanks.

Sinks sometimes ARE plumbed into the black tank. My previous Winnebago MH had the bathroom sink plumbed like that. Made adding water to the black tank a cinch. Just turn on the bathroom sink tap.

Don't mistake the fact that you have never seen it as it is never done.

[kellem]

Highly doubt a sink is tied into black tank, no way.
What your experiencing is hot temps and grey tank is extinguishing odor.
Our grey tank is just as pungent as black tank during hot months.

Just dump a cup of bleach into kitchen sink and let it slosh around during travel......we've found it's always the dish water vs shower water incase you have 2 gray tanks.

[kmdiddy]

Little update here...got everything fixed up and also installed a metal tail-piece so they can't get into my trap again. I see all the messages about sinks tied to the black water tank and it was odd to me as well but now that I know, I followed another's post that indicated they turn the outside sink on before pulling out to put more water in the black water tank. I used to sit there with my foot on the toilet supply to add water...SO MUCH EASIER NOW. As indicated, the more water in the black water tank...much easier to get a clean dump! Thanks for everyone's post here!

[mudhound]

gross!! Sounds fixable

[lane_hog]

cougar28 wrote:
I don't ever recall any sink being plumbed into a black water tank on a rv. Either something else is happening or it plumbed wrong.

Quite common on Class C's and Class A's. On trailers, it wouldn't surprise me in a half-bath.

[CharlesinGA]

My motorhome was plumbed with the bathroom sink going into the black tank. I used a dishpan in the kitchen sink and carried it back and dumped it in the bathroom too. Lots of water in the black tank makes it much easier to get a good through dump of the black tank.

Indeed, many RVs are done this way, for good reason.

Charles

[Bobbo]

falconbrother wrote:
Sinks drain into the grey tank. How is it possible for black tank contents to enter any sink or bathtub? The black tank sits under the pooper.. Nothing else runs into it.

If you will read the entire thread, you will see that some sinks, indeed, do drain into the black tank. My first RV had one plumbed that way.

[time2roll]

blaczero wrote:

time2roll wrote:
I would be looking at putting a regular ball valve on that drain. Open when parked and in use. Otherwise close it.

a ball valve on PVC drain? Never seen that.

1.25" or 1.5" is available at any decent hardware store.
I would not trust a stopper.
RV gate valve would be fine too.

[cougar28]

camperfamily wrote:
falcon brother, some sinks do indeed drain into the black tank. Seems to go against logic of grey/black separated tanks but its done.

Seems to me some black tank drain into sinks also! LOL

[camperfamily]

falcon brother, some sinks do indeed drain into the black tank. Seems to go against logic of grey/black separated tanks but its done.