why do you use plumbers putty, instead of silicon?
Because I was told to!
![Gap :gap:](https://board.marlincrawler.com/Smileys/marlin/gap.gif)
Actually I think b/c it retains more stickiness and maybe a bit more 'give' if anything moves even very slightly. I have seen silicon separate from metal just enough to allow fluids to seep past it.