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Cast iron rotary gear pump head with 1/2 inch NPT ports

Dayton

Dayton 6DHH7 Rotary Gear Pump Head, Cast Iron, 1/2 in NPT, 40 psi

SKU CH-KX29-6QH2R MPN 6DHH7

Cast-iron rotary gear pump head with 1/2 in NPT ports, rated to 40 psi and 375 °F maximum temperature

  • TypeDrain Components
  • Cast iron body resists wear and corrosion
  • 40 psi maximum pressure handles demanding fluid transfer
  • 2 ft suction lift enables flexible installation
  • Viton lip seal withstands 375 °F operating temperature
  • 1/2 in NPT connection fits standard piping systems

Product Identity

The Dayton 6DHH7 is a cast-iron rotary gear pump head designed for fluid-transfer tasks in plumbing and automotive workshops. It suits technicians who need a compact, positive-displacement head rated for 40 psi maximum operating pressure.

Installation Notes

The head mounts on a carbonator-compatible motor frame using a 1/2 in shaft and 1/2 in NPT connections. Common issues include exceeding the 6.2 ft suction lift limit, running above 375 Degrees F or below 40 Degrees F, and using fluids thicker than 100 SUS viscosity.

Interface Limits

The 1/2 in NPT ports and spur-gear design restrict flow to applications within the stated pressure and temperature range. Viton lip seals handle the specified limits but are not rated for continuous operation beyond 40 psi or 375 Degrees F.

Highlights

  • Cast iron body resists wear and corrosion
  • 40 psi maximum pressure handles demanding fluid transfer
  • 2 ft suction lift enables flexible installation
  • Viton lip seal withstands 375 °F operating temperature
  • 1/2 in NPT connection fits standard piping systems

Specifications

TypeDrain Components
BrandDayton
Model6DHH7

Questions about this item

How can I confirm the pump head is operating correctly after installation?

Verify that suction lift stays within 6.2 ft, discharge pressure does not exceed 40 psi, fluid temperature remains between 40 and 375 °F, and the Viton lip seal shows no leakage.

What comes in the box and what must I source separately?

The box contains the cast-iron rotary gear pump head with 1/2 in NPT ports and 1/2 in shaft; you must supply a compatible carbonator-mount motor of at least 1/2 hp and the appropriate piping.

Which version should I choose for a 40 psi system using 1/2 in NPT connections?

This single model 6DHH7 matches those exact specifications — 40 psi maximum pressure, 1/2 in NPT ports, cast-iron body, Viton lip seal, and spur-gear design — so no alternative version is needed.

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