Obtain the long, notched 2-inch PVC pipe

Coat 2 to 3 inches of the 1.5-inch PVC pipe (closest to the housing) and the inside of the long 2-inch PVC pipe with PVC primer. Coat both of these primed areas with PVC cement.

Insert the 1.5-inch PVC piece (connected to the housing) inside of the 2-inch PVC until the conduit fitting touches the 2-inch pipe. Twist a quarter turn while inserting and hold in place for 30 seconds.