Allegro 9850 Model 4000AD Air Driven Pump - CLOSEOUT

Ship 3-5 business days
83.00 LBS
9.50 (in)
15.50 (in)
23.50 (in)

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 or above and get 5% off
  • Allegro 9850 Model A‐4000AD Air Driven Pump. Shop Now!
  • Allegro 9850 Model A‐4000AD Air Driven Pump. Shop Now!
Frequently bought together:


Portable air source for up to four full or half face respirator users, or three hood users. Ideal for use when electric power is unavailable or undesirable. Solid performance in multi-worker applications, abrasive blasting. cleaning, sanding or chemical handling operations.

Product Specifications:


  • Rigid metal base and housing
  • Brass and galvanized steel plumbing
  • Quick-connect Rectus (OBAC) air fittings (other fittings
  • available on request) 
  • Adjustable brass pressure relief valve
  • Pressure gauge 0-15 psi (0-1.03 bar)
  • Fan guard 
  • Powder coated gray


  • Type: Oil-less, rotary vane, direct driven
  • Vanes: Carbon construction (4 ea/ replaceable) (3.5 in (8.89cm) X 1.3 in (3.40cm) X 0.188 in (.47cm)
  • Inlet Filter: 50 Micron felt material with metal grid inlet filter housing.
  • Exhaust Filter: 0.3 Micron HEPA
  • Working Pressure: 2-12 psi (.14-.83 bar) (15 psi (1.03 bar max)
  • Performance: 0-20 CFM (0-33.98 m3/hr) (adjusted via pressure relief valve) 
  • 0-8 CFM (0-13.59 m3/hr) @ 50 Hz (adjusted via pressure relief valve)
  • Airline length: 100 feet (30.4m) maximum from pump to respirator (sold separately)
  • Noise level: At pump: 90 dB
  • At 6 feet (1.82m): 74 dB
  • At 10 feet (3.04m): 72 dB

*Warning: Ambient Air Pumps are not to be used with generators
**Warning: Air inlet to the pump must be located where breathable air can be assured at all times

Air Motor:

Plumbing: Galvanized with brass ball valve
Design: Four carbon vane design for precise control and for stalled start-up operation
Muffler: PVC extension to prevent freezing or icing
Filtration: Zinc manifold, ABC cover, nylon guard, polycarbonate bowl with a 40 micron sintered
polyethylene coalescing filter element and 0-160 psi (0-1103 m3
/hr) pressure gauge
Lubricator: Zinc manifold, ABS cover, polycarbonate bowl with fill port for easy servicing


Length: 23 1/2 in
Width: 9 1/2 in
Height: 15 1/2 in
Weight: 83 lbs

Important Notice: All Respirators, Cartridges, and Filters to be returned must be unopened and in it's original packaging. All opened packages are not returnable.

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