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The black abs pipe used in RVs should be the same size as PVC pipe you would use in your house. They should interchange and glue together with a all-purpose glue.
Like stated though I would use a fernco fitting as a flexible connection.
I would think if you buy an RV rigid extension piece that will connect to your trailer you can cut one end off in fernco from that to the white PVC. But you have to use regular PVC not the thin wall white stuff that you would use for like downspouts
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