Atlas Professional Cartridge Flow Restrictor for low-viscosity fluids, and 2-part formulas with large differences in viscosity (thickness) between the two parts.
Simply insert a red flow restrictor into the outlet end of the cartridge and then screw on the mixing nozzle over it. This restrictor will control the flow of the low-viscosity material so that it will properly mix.
MixPac Part Number (301631)