Product review (1 stars): Cheap, not worth it.
This does not match up to the vent dimensions of the vent I intended to replace.  The thin, cheap, hard plastic broke while trying to install.  Its dimensions are NOT the same as stated.  The metric (I'm sure)  diameter dimension is close, but not close enough to standard "English" dimension of the vent pipe.  Not worth the hassle of returning.  I just threw it out!