Buy Bosch 3931A-PB 120-Volt Wet/Dry Vacuum CleanerBosch 3931A-PB 120-Volt Wet/Dry Vacuum Cleaner Product Description:
- 4 modes of operation for maximum versatility: regular, power tool, Pulse-Clean, Pulse-Clean with power tool
- Tank-only, plastic bag, paper bag, or slurry bag collection systems
- Power broker dial allocates power between vacuum cleaner and connected power tool to optimize usage
- Exclusive Pulse-Clean electromagnetic filter cleaning system shakes the dual filter cartridges
- Filters sit above maximum dust or water accumulation height to help maintain maximum airflow and suction
Customer Reviews
Most helpful customer reviews
20 of 20 people found the following review helpful.
missed expectations
By kkaz
I purchased this vac together with the Bosch 1773AK 5-Inch Concrete Surfacing Grinder, extra hose, and a hose adapter. I was looking for a self-cleaning vac with a tool switch in order to increase productivity for my DIY sanding and grinding. To be clear: I am not a contractor, I just happen to be a tool affectionado, and I don't mind a high price if I could save myself some time as a result.So, I had some gypsum wall patching to sand at my home, and two small concrete pads to clean from the old paint and mortar droppings. The idea seems wonderful: the operation of the grinder would switch the vac on and off and the vac would electrostatically clean its filters during the breaks, when the tool does not operate. How come all vacs on the market are not designed like that?So instead of a separate $18 Craftsman Auto Switch (Item# 00924031000) and the $40 Oneida Molded DIY Dust Deputy Cyclone to attach to my shop vac (which would probably give it a similar functionality), I decided to get this $536 vacuum, hoping that Bosch engineers designing this tool might actually anticipated what a contractor or DIY may need, and I would get a complete all-in-one solution as a result.Well, what a disappointment it turned out to be! The vac runs the pulse-cleaning mode with a startling DOO-DOO-DOO sound, but the filters after such cleaning operation are still full of dust. Tried several times, still no results. However, the sucking efficiency drops much slower than in my old vac (probably because the aggregate filter area is larger and the motor is twice as powerful).Anyway, dust clouds ruined my living room at some point, so, I had to go back to the old routine: washing filters several times a day with a strong stream of water from a garden hose for several minutes, and attempting to dry them afterwards. Is it much improvement for $535.99? I don't see much difference.Also, apart from this main issue, there are several minor disappointments: the bond between a hose and its connector comes apart easily, and it's a hassle screwing it together every now and then. The front wheels of the main vac unit (which is quite heavy) are too small to negotiate a smallest obstruction (on a flat ceramic tile floor), so whenever a power cord gets in the way (which is very often), the vac needs to be dragged forcefully, separating the hose and cable connections. The the 6Amp vac is designed to drain juice from the same receptable as the 10Amp tool which is connected to it, occasionally tripping a 20Amp pole breaker.Suggestions for Bosch engineers: work out the self-cleaning issue (perhaps with a counterblast of air?), get better swivel hose connectors, provide much larger wheels, separate tool and vac circuits (a remote switch would be nice to avoid dragging one more power extension). And perhaps go in the field and get dirty once in a while to better understand the needs of someone who may be using your equipment.Also, it's seems like a rip-off, the $536 vac doesn't come with the nozzles. Basket (VAC014), nozzles and wand (VAC011) are optional and cost extra $85.
13 of 14 people found the following review helpful.
Nice Vac with Shortcomings
By dabotofus2
This thing is solidly built and powerful. Generally pleased - much nicer than the old Wet/Dry Vac that it replaced. Pretty quiet, although not as quiet as the reviews indicated. The bags are nice and hold a lot. Have not used the automatic turn-on feature with power tools.Three nuisance problems:(1) It's fairly easy to move with the high handle, but still gets caught on cords. My solutions was to buy the 15M hose and leave the vac mostly in place.(2) The attachments are a little loose on the hose fitting. This is very minor.(3) The hose diameter is small - no more than 1.5 inches ID at the fitting. Clogs relatively easily by small slivers of wood when hooked to router table. Have to occasionally clear to maintain vacuum strength.More of a curiosity than a problem is that the hose tends to build up static when running continuously as dust collection for the router. After running a while the router shavings are attracted to the hose and stand out like fur, similar to iron filings on a magnet.None of the above are more than minor nuisances. Would buy it again.
4 of 4 people found the following review helpful.Small diameter of connecting tube
By Arnaud T.
I bought this vacuum for my garage and use it both to clean the place after working there and to minimize dust generation by connecting it to my tools.I like it very much and use it a lot.Overall this is a great product with just a few things not perfect, which gives it an overall 4 stars.What I like:* The plugging tool function and the available choice to use it or not (2 different settings).* The adjustable power* It moves around very easily, without effortWhat could be better:* Setting up the collection bag in it's chamber is a little bit of a delicate work. Could be more mindless.* The vacuum hose has a small diameter (similar to a household vacuum). Which makes it easy to plug into hand tools but requires adapters (not provided) for any stationary tool. Given its small size it was probably designed to be used only with hand tools and to have a full size shop vacuum for the stationary one.* There is no dedicated way to store on it the vacuum hose. It kind of holds by wrapping it around the handle bar but its not the most stable way.Anyway I recommend buying it and will buy it again if needed.
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