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B-9 is now known as Professional Chem-Dip (part #0905), while B-12 Chemtool can be either our carburetor cleaner aerosol (parts #0117 and #0120) or a pourable fuel treatment (part #0116). In either case, B-12 Chemtool is not well-suited as a parts dip due to its fast evaporation rate and it’s extreme flammability. If you have parts that require extended soak times, such as stuck piston rings or old metering blocks, then Chem-Dip is your best bet.
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