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For a vent a rubber clamp should be fine.
I have a section of 4" sewer line under my house black plastic to old black iron with rubber sleeve clamps... been no problem for many years.
Steal/iron to copper is the big no-no.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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