Is this some sort of new fangled S-trap?

[plummen]

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Saw this today in my travels

[Erby]

Sure. The combustion condensate that gets trapped keeps combustion gasses, that manage to get past the trap, from coming back into the house.

[:-monkeyd[:-monkeyd[:-monkeyd

[rkenney]

That was installed by the same guy that did this gas drier. Hell, if you've got flex duct. . . might as well make it flex.

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[Denray]

Yep

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[HVACMASTER]

Truly Unbelievable