I have a kholer devonshire tub spout that is a slip on. It slips on to a 1/2 copper and then there is a hex nut under it that you tighten. I would like some advice about properly afixing this. It does not seem to slip on very far and it seems like water would shoot backwards when the diverter is pulled up for the shower. There seems to be some hard plastic in there and I am not sure how hard to push for a water tight connection. Should I use any putty in there? Seems unstable to me, because I have never done it before. So I am asking for help before I do something wrong and ruin the spout.
Thank you!