my problem with this whole thing. the measurments for the roof flashing were no where close and i mutilated the first roof flashing and have to do it over again tomorow. and yes getting the pvc into the 90 degree elbow small side is not that easy after 2 hours of messing with it and cutting open my hand. im going to try again tomorow and see how this turns out. only thing i changed is i painted the pvc pipe blue to just have a different look.