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Lakejumper

Northern California

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Posted: 09/30/21 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all of the quick responses. I’m connected to city sewer and already have a “y” connector under the house in the Crawlspace. We are extending the cleanout through a vent cover. We decided to use a 4” cap. I already have a Flojet macerator and also want to be able to use the 3” hose if needed. I think that we have it covered.


Lakejumper

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wa8yxm

Davison Michigan (East of Flint)

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Posted: 09/30/21 02:40pm Link  |  Quote  |  Print  |  Notify Moderator

Dick_B wrote:

I'm thinking the plumber would decide that but I think ours is at least four inches; probably more like 6.


If you plan to use it both as a Sewer clean out and RV dump go with the size of the sewer line.


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Dutch_12078

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Posted: 09/30/21 02:43pm Link  |  Quote  |  Print  |  Notify Moderator

The sewer line from our cottage to the septic system is 4" PVC running right behind the RV pad. I had the contractor install a 4" sanitary 'T' and riser with a 4" cleanout cap where it's convenient to connect the stinky slinky when he installed the new system.


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Cummins12V98

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Posted: 09/30/21 03:19pm Link  |  Quote  |  Print  |  Notify Moderator

3” is more than enough for a RV dump.

Bottom line pipe it the size of the clean out.


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JRscooby

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Posted: 09/30/21 03:38pm Link  |  Quote  |  Print  |  Notify Moderator

More important than the pipe size is the slope. To flat, it all will lay in pipe. Too steep, and the liquid will leave the solids to lay in pipe, dry out, and start clog.
And make sure the pipe is supported to hold the weight of a full pipe, so the slope does not change.
Same flow volume, same slope, the smaller pipe will have a deeper stream, less likely for floaters to bottom out. This gets to be important because most waste tanks drain out the side. The last few inches drains progressively slower.

ferndaleflyer

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Posted: 09/30/21 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

Our in town house has a clean out at the property line right into the city sewer. I don't know what size it is but my DP drain hose screws right in to it. Built that house 5-6 years ago and have used it ever since.

mobeewan

Hampton, Va

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Posted: 09/30/21 07:43pm Link  |  Quote  |  Print  |  Notify Moderator

Where I used to live, there was a 3 inch clean out and 3 inch terra cotta pipe. Clean out was under the trailer 4 feet from the trailer connection. I connected straight to it with some 3 inch adapters and it worked fine.

pitch

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Posted: 10/01/21 07:18am Link  |  Quote  |  Print  |  Notify Moderator

Code will dictate the proper size.

Cummins12V98

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Posted: 10/01/21 08:18am Link  |  Quote  |  Print  |  Notify Moderator

pitch wrote:

Code will dictate the proper size.


OP is using an existing clean out under the house and will be extending it outside. If the clean out pipe size is 3" you sure don't want to increase it to 4" and if it's 4" you sure don't want to decrease it to 3".

So as I said before whatever size it is that is the size pipe that needs to be used.

So let's say the existing clean out is 3" and current code says 4". What do you suggest the OP does then???

OP, extend what is there and be happy!

Lakejumper

Northern California

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Posted: 10/01/21 09:12am Link  |  Quote  |  Print  |  Notify Moderator

Thank you everyone! Great feedback! We’re using the existing pipe diameter.

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