A strong performing diaphragm pump well-suited for medium pressure spraying applications with a variety of general agricultural chemicals.

Annovi Reverberi AR503-SP Diaphragm Pump

Annovi Reverberi AR503
USD $856.74
  • SKU: AR503-SP
AR Gearbox for 1" Shaft
USD $450.99
  • SKU: AR1639
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A strong performing diaphragm pump well-suited for medium pressure spraying applications with a variety of general agricultural chemicals.

Product Description

Provide your spraying system with the high performance it requires to maintain its effectiveness throughout the season with this Annovi Reverberi AR503-SP Diaphragm Pump.

With the ability to attain flow rates up to 14.3 gpm, this medium pressure diaphragm pump works well on small-to-medium sized sprayers for medium-height tree spraying applications up to about 60' (18 m). It also can be used in many other spraying applications, including agricultural spraying, crop spraying, greenhouse spraying, orchard and vineyard spraying, weed and pest control, de-icing, and much more. The strong performing BlueFlex diaphragms, along with its anodized aluminum and stainless steel liquid handling parts, permit use with a variety of general agricultural chemicals, including herbicides, pesticides, insecticides, fungicides, liquid fertilizers, de-icing materials, and other hard-to-handle fluids.

The strong BlueFlex diaphragms establish a new benchmark for diaphragm toughness, even in tough operating conditions. They are manufactured with some of the best performing diaphragm material currently available, perfect for handling many general agricultural chemicals, like herbicides, pesticides, insecticides, as well as some of the more aggressive and hard-to-handle chemicals. The BlueFlex diaphragms have a shape and thickness that have been carefully optimized to reduce mechanical stresses during the working cycle of the pump, even in tough operating conditions.

Some other features include a newly-designed diaphragm cut-out system that prevents contact tearing even in heavy-duty operating conditions, pistons with rings for a more efficient oil cushion system to protect diaphragms, and spherical sector profile valves for lower flow resistance and improved volumetric efficiency.


  • Max. Flow Rate: 14.3 gpm (54.1 lpm)
  • Max. Pressure: 580 psi (40 bar)
  • Max. Pump Speed: 550 RPM
  • Max. Fluid Temperature: 140° F (60° C)
  • Max. Power: 5.6 HP
  • Port Sizes: 1-1/4" (32 mm) HB inlet, 3/4" (19 mm) NPT outlet
  • Shaft: Flanged for kit or gearbox attachment
  • Anodized aluminum housing
  • Anodized aluminum and stainless steel liquid handling parts
  • Three semi-hydraulic BlueFlex diaphragms
  • Buna seals
  • Die-cast casing with oil-immersed mechanism
  • Oil drainage stopper
  • Air-hydraulic damper for smoother operation
  • Crankcase Oil Capacity: 22 oz.
  • Overpressure valve with reset and cardan protection
  • Weight: 25.4 lb. (11.5 kg)
  • Recommended Pressure Regulator: RM40
  • Recommended Gearbox: AR1636 for attaching to 5-6.5 HP gas engines with 3/4" shafts or AR1639 for attaching to 8-18 HP gas engines with 1" shafts

Recommended Drive Options:

  • AR43393 1-3/8" 6-Spline Male Shaft Kit
  • AR43394 1-3/8" 6-Spline Female Shaft Kit
  • AR43390 1" Male Solid Keyed Shaft Kit
  • AR43397 Hydraulic Motor Flange Kit

Recommended Repair Kits for the Annovi Reverberi AR503 Diaphragm Pump:

  • AR43297 BlueFlex, AR43295 Desmopan, AR43294 Buna Diaphragm Repair Kits
  • AR1987 Valve Repair Kit
  • AR1984 O-Ring Repair Kit

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