The bosses are for vacuum tapping or any bracket, NOT injection. The same pattern is used for all three, simplicity is best. I made my own flow bench from scratch to understand what was required,so the condescending remarks Scott about the simple guy without the skill set for this is uncalled-for, get off your high horse. I spoke to you originally about the viability of selling a head not design consultation as you call it. Where are the positive remarks that would have been plentiful when I joined Inliners International many years ago.