An anti siphon is NOT a regulator, and a regulator is NOT an anti siphon. The Max Flo is simply a regulator, it regulates gas flow, and it will help filter out liquid CO2, but an anti siphon is a tube installed in your tank that prevents liquid CO2 from escaping from the bottle, before it can even get into the Max Flo. One is not a substitute for the other, and you'd be best off using BOTH.