I have a radon fan that is putting more noise into the house than i like. It is connected to the pipes with PVC coupling. i think rubber would pass less vibrations, but haven't seen them in years. Are they still made?

So here is my situation. I have used "Great Stuff gaps and cracks" to seal up an attic plumbing vent bypass. The pipe is a 3 inch copper. A blob of the foam ended up going a bit higher than other sections (might have accidental applied an extra bead at that location), and is now touching, and covered a small portion of the soldered T fitting (the T fitting is few inches above the gap). Just wondering if this will cause any problems later? Pressure or chemical wise? I imagine it probably wouldn't cause any issues, but being my first time using foams in a can, just want a piece of mind, or have a plumber on call ready if it is a no no. Thanks. Picture of said pipe and "blob". [url=http://imgur.com/a/2T9LY/layout/grid]Filled attic bypass with foam - Album on Imgur[/url]