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I have a single SVP that extends through the roof of my house. I needed to free up that particular section of roof for solar panels so earlier today I cut off the pipe in the attic and replaced it with an AAV, as I was led to believe from the website at...

I'm trying to work out these rectangular bits are between bricks at various places around my house. There are a couple visible around windows (possibly due to mortar falling off around it?) but there's also one visible on the edge of the wall that the garage door sits inside. Either way...