I find getting a 1/2 PVC tee joint and 45degree elbow coupler, cutting the 45 elbow in half and do the same thing you did with your tee. Then just glue the half 45 on top of the tee and your done. I find this quite simpler and easier to do, because you don't have to worry about not getting the 45 degree cut right on the coupler. This isn't full proof though, this is just a suggestion to all of you. This might work it may not who knows.