Weird clog in ABS downspout - help!
One of my downspouts was overflowing last rainy season. Down at ground level the ABS pipe overflowing. I pulled out the
bottom section of downspout and looked down there to see. A mess. I cleaned out the mud and saw a weird metal dome thing. Valve? Flange? Pressure cap?
What is it and what is it doing there? I can upload pics if any is intereted. thanks,