Shop-Vac® 5 Gallon* 4.5 Peak HP** BullDog® Wall Mount Wet Dry Vac

Catalog No. - 3942100  Model No. - 5HM450  

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Peak HP**

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Shop-Vac®DIY & Workshop Series Wet Dry Vacs

The Shop-Vac® 5 Gallon* 4.5 Peak HP** BullDog® Wall Mount Wet Dry Vac provides the convenience of a centralized cleaning system in your garage, workshop, hobby room or anywhere a hands free vacuum is desired. This can easily be removed from the mounting bracket when it is needed as a portable vac.


  • Cord Length: 6 Feet
  • Hose Size: 1.25" Diameter
  • Warranty: 3 Years
  • Lock-On® Hose
  • Wall Mountable Design
  • Hand Held Design



  • 25-foot by 1.25-inch diameter Lock-On® hose
  • two 1.25-inch diameter extension wands
  • 12-inch deluxe nozzle with brush and squeegee inserts
  • crevice tool
  • round brush
  • gulper nozzle
  • tool storage bag with wall hook
  • wall mounting bracket


  • Small Cartridge Filter
    (90398 Type AA)
  • Small Foam Sleeve
    (90526 Type CC)
  • 5 Gallon* Disposable Filter Bag
    (91932 Type O)


Airflow, Max

145 CFM

Sealed Pressure

55 Inches

Electrical Ratings

120V 60Hz 8.9 Amps

Peak Air Watts


Performance tested by Shop-Vac® lab method, not ASTM test method 

Horsepower Rating

**"Peak Horsepower" (PHP) is a term used in the wet-dry vacuum industry for consumer comparison purposes. It does not denote the operational horsepower of a wet-dry vacuum but rather the horsepower output of a motor, including the motor’s inertial contribution, achieved in laboratory testing. In actual use, Shop-Vac motors do not operate at the peak horsepower shown.

CFM (Cubic Feet Per Minute)

CFM is a measure of the quantity of air moved by the vacuum motor at a particular system load, such as 2-1/2" orifice. Your actual system load is determined by the type, size and length of the hose used, the accessory tool used and the filter system used. A dirty filter system can drastically affect the suction and air flow. The filters need to be cleaned regularly and replaced as necessary to avoid reduced suction and air flow.

SP (Sealed Pressure)

Suction pressure represents how far up a glass tube a vacuum motor will lift a column of water. This function is measured in inches. Maximum suction pressure or sealed water lift is obtained at zero air flow. Suction pressure decreases as air flow increases.

Vacuum Performance

Vacuum performance or air power is the rate of work performed by a vacuum cleaner. Air power is a function of suction and air flow at an operating point. Air power is reduced by dirty filters, leaks and attachments used.