• Model #9-11-55 is the Fein Turbo I dust extractor
• Model #9-55-13 is the Fein Turbo II dust extractor
• Model #9-77-25 is the Fein Turbo III dust extractor
• Model #9-11-20 is the discontinued Mini Turbo vacuum (replaced by 9-11-55)
• Model #9-20-13 is the older-style 10 gallon capacity vacuum