Review on Fernco GIDDS 301118 P1056 64 Coupling 6 Inch by Brent Ayyagari

I installed this on a Radon Away RP265 Radon Fan. This worked for me. The 4" side is perfect for a 4" PVC pipe (apparently a pipe, not a larger pipe fitting). The 6 inch side was a bit oversized for a Radon fan (a fraction of an inch) but was easily tightened around it snugly. At first I was worried it would be too loose because it's not as tight as the 4 inch side. originally on a 4" pipe. After breathing it around, however, it shut tight. I was able to lift the fan by the fitting (very securely in place) and it had a very tight seal. My fan has good pressure and i have tested it and it has no air leaks i have seen some reviews that suggest this is not suitable for a radon fan but my experience is not true you just need to tighten it properly and it works fine.