I ran a brass T on my DSM setup, and would always catch flack about how it wasn't ideal for flow because it's a T and not a Y, yet I never really seemed to have an issue with it. The metal Y's I'm finding are in he $25+ dollar range, which I'm too cheap to do that. While I would much rather have a metal fitting, if others are using this without issue I may give it a shot as they are $1. Or I'll just hit up Ace and run another brass T and say screw the nay-sayers