Qualitek 302 Solder Flux Rework Pen, No-Clean, Water Soluble, Low Solids , .33 oz; 50-30233 Unique tool for rework and touch-up soldering. Allows a controlled application of flux. Eliminates mess from flux bottles. Ideally suited for SMT rework, TAB assembly operations and component applications. No. 302 water soluble low solids no-clean formulation.