This vent must have been for the childrens Doll House to small for Grown up houses???
must be a snorkel.
Paint it also, to prevent UV damage.
Nice flashing !!!
Does anyone have pictures of PVC damaged by UV?
They are trying to reduce greenhouse gases. 
Interesting…it says that PVC pipe is not damaged by UV/sunlight beyond the requirements specified in ASTM D 3034 for the manufacturer’s quality control of new pipe.
http://www.benmarksupply.com/Archives/issue4.htm
Full report:
http://www.uni-bell.org/pubs/uni-tr-5.pdf
PVC piping should be painted if installed in direct sunlight.
http://www.ppfahome.org/pvc/faqpvc.html
But, I’m wondering, why paint it if the degradation caused by UV/sunlight does not damage it beyond the requirements specified in ASTM D 3034 for the manufacturer’s quality control of new pipe.
That’s an interesting study, I read many years ago, that PVC would degrade from exposure to UV rays, but the thing that made me believe it to be true was personal experience. I left some outside and it became very brittle, so brittle that it would crumble in my hands. if it wasn’t the exposure to UV rays then I wonder what it was? Maybe all PVC did not have the UV inhibitors in it. I will see if I can find a piece of it laying around somewhere. Thanks for the links to the study. Ken
This piping is fubar from the sunlight.