This transition fitting saves time while creating a sleeker, more attractive fan installation for outside fan installation. Eliminates the use of extra PVC fittings to bring the pipe flush to the house. Accepts 4 inch rubber coupling from radon fan and 4 inch PVC at the top of the fitting.
To use a transition fitting with 3" pipe you will need the special bushing. Fits in the upper end of transition fitting and can be adjusted to place pipe closer or farther from the wall. Lower end of transition fitting is 4" OD and would require a 3x4 coupling to connect to 3" PVC pipe or a 3" radon fan.