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This is because the acidity of the soil destroys the white PVC
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What?
PVC pipe is allowed in most codes for direct burial...Usually after a certain depth, different schedule PVC is used, Sch 40 near the surface (frost line to 6') then Sch 80..I've never seen Sch 120..
And Fernco makes multitudes of adapter fittings.. just pipe such that you never present a leading edge to flow..