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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Poop in outside sink

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Huntindog

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Posted: 04/05/21 08:44pm Link  |  Quote  |  Print  |  Notify Moderator

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 is actually pretty common. All 4 of my Trailers have been that way.


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kmdiddy

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Posted: 04/06/21 06:23am Link  |  Quote  |  Print  |  Notify Moderator

I am positive it is black water, trust me...the things I have seen cannot be unseen. So I tore apart the sink last evening and it appears that a mouse decided to chew the catch in the sink tail piece to get into the pipe. Then it decided to chew the internals of the waterless drain which cause my issues.

I really like the suggestion to put in a ball valve. That is a great idea. The only issue is that I do not have enough room to have the waterless trap and ball valve installed. It would be one or the other for me.

kmdiddy

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Posted: 04/06/21 06:26am Link  |  Quote  |  Print  |  Notify Moderator

Also...I was totally unaware of plumbing a sink to black water tank as well however after much research, its quite common and beneficial. I will be using the trick of filling the tank with the outside sink going forward before dumping.

bgum

South Louisiana

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Posted: 04/06/21 06:34am Link  |  Quote  |  Print  |  Notify Moderator

On Airstream Bambi there is only one tank. The manual states to insert a drain stopper in the shower when towing as is possible for tank contents to spill from the drain in a hard stop.


Get a stopper.

kmdiddy

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Posted: 04/06/21 07:13am Link  |  Quote  |  Print  |  Notify Moderator

@bgum thanks! I also thought of that as well. I think I am going to do that as well. I have used the rubber seals with washers and a wing nut in the past to seal off lines. I am going to look for one of those to do the same here.

I ordered a steel tail piece replacement. I will take that to the hardware store to size the appropriate seal. Thanks for the advice.

falconbrother

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Posted: 04/07/21 07:55am Link  |  Quote  |  Print  |  Notify Moderator

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.

camperfamily

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Posted: 04/07/21 08:56am Link  |  Quote  |  Print  |  Notify Moderator

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


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cougar28

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Posted: 04/07/21 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

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


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time2roll

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Posted: 04/07/21 02:52pm Link  |  Quote  |  Print  |  Notify Moderator

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.


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Bobbo

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Posted: 04/07/21 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

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.


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