Hypro D503 and Hypro D503GRGI

Medium pressure pump with maximum 14.3 GPM and 580 PSI.
Hypro D503 and D503GRGI sold separately.

Hypro D503 and D503GRGI sold separately.

  • Hypro D503
    USD $844.16
    • Buy 5 for USD $759.74 each and save 11%
  • Hypro D503 with G-Box & Reg (8HP+)
    USD $1,431.83
    • Buy 5 for USD $1,288.65 each and save 10%
  • Hypro Pump
    USD $1,445.41
    • Buy 5 for USD $1,300.87 each and save 10%
  • Hypro Gearbox for D50, D503, D813, D1064, D1265
    USD $551.86
    • Buy 2 for USD $519.30 each and save 6%
    • Buy 6 for USD $497.23 each and save 10%
  • Hypro RM40 Control Unit for D503
    USD $232.79


The Hypro D503 and D503GRGI are medium pressure diaphragm pumps. The GRGI version is ready to be mounted on a gas engine with a 1" keyed shaft. The 9910-D503GRGI3/4 is for gas engines with a 3/4" shaft. It is recommended that you use 8 HP engine or greater with this pump, that would have a 1" shaft.

This is an excellent pump that can be used for landscaping and agricultural applications. Because it has a pumping capacity of 14.3 gallons per minute, it would work well in medium height tree spraying, up to about 60'. Perfect for handling a range of agricultural chemicals, for instance, herbicides, pesticides, liquid fertilizers, and more. These pumps are designed to provide the operator with optimal performance of small to medium sized sprayers.

  • Max. Flow: 14.3 GPM
  • Max. Pressure (D503 / D503GRGI): 580 PSI
  • Max. Pressure (D503GRGI34): 290 PSI
  • Max. Rated Speed: 550 RPM (D503), 3600 RPM (D503GRGI / D503GRGI34)
  • Max. Fluid Temperature: 140 degrees Fahrenheit
  • Three diaphragms, semi-hydraulic
  • Shaft: Flanged adapter
  • Port Sizes: 1-1/4" (M) hose barb inlet, 3/4" NPT outlet
  • Housing: Anodized aluminum
  • Mounting base included
  • Weight: 28 lbs.
  • Pump shaft rotation: CW and CCW
  • Recommended Regulator for the D503: 9910-RM40
  • Recommended Repair Kits for the D503: D503 Repair Kit (combination of both 9910-KIT1881 and 9910-KIT1987)
  • The 9910-KIT1642 Gearbox is recommended for the D503. However, the pump can be used with the 9910-KIT1640 Gearbox, only if the pump is operated at a lower pressure that does not exceed the 5 HP gas engine compatibility.
  • D503GRGI- - - 3 diaphragm pump - assembled with gearbox 9910-KIT1642 and control 9910-RM40 for mounting on 8 HP gas engines.

Another common use of the Hypro D503 Pump is for pressure testing pipes and sewers. Hydrostatic test pump.

If your D503 has mixed oil (because the oil has turned milky grey in color and you do not have the same pumping ability) buy the repair kit. See Related Products.

For more information on this D503 Diaphragm Pump by Hypro, please consult the Related Information section.

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