Nilfisk ALTO Aero 21 HEPA - Wet/Dry HEPA Vacuum w/Stainless Steel Tank - Aero 21 INOX HEPA is a 20 liter (5.2 gallon) contractor-grade wet/dry vacuum that features durable construction, low-noise level, and Push & Clean semi-automatic filter cleaning. Aero 21 INOX HEPA includes a stainless steel collection container, certified HEPA filter, built-in storage for hose and accessories, exhaust blow function, and comes with full accessory kit and synthetic dust bag. Suitable for drywall dust and meets EPA lead requirements.