Creative trap use

[homnspector]

I didn't know whether to post this under HVAC or plumbing, so I will post it here.

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[Phillip]

Creative use of flashing that normal used on a plumbing vent.

Is this on a roof or concrete?

[fqp25]

O.K. - I'll say the condensate drain is directly tied into something,(hopefully a drain line that is properly trapped).

The other vent is a plumbing stack with a 4x2 reducer and a 2x 1 1/2" slip joint coupling which a brass/chrome trap has been installed.

Maybe to keep out the torrential rains in Arizona?