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Protek Specialty

DP Series Hand Diaphragm Primer

Regular price $165.46 USD
Regular price Sale price $165.46 USD
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The Hand Diaphragm Primer Pump (DP) is an air pump that creates vacuum suction in a centrifugal pump priming line and pulls water up into the pump to prime it. These centrifugal pump primers are popular for their portability and simplicity.

Protek Specialty Diaphragm Primer Models: DP5, DP7, and DP9

The DP primer has a flapper check valve in the diaphragm and a disk check valve at the bottom of the unit. Air flows through the bottom check valve on the diaphragm up stroke then through the diaphragm valve on the down stroke. Diaphragm is actuated through a connecting rod eyebolt attached to a fulcrum handle bracket.

The Protek Specialty DIAPHRAGM PRIMER PUMPS are centrifugal pump primers, ideal for  use in irrigation, firefighting, liquid extraction, and fluid distribution applications.



Lightweight, portable aluminum alloy body.


Easily mounted on most centrifugal pumps.


Tough and durable rubber diaphragm.


Units have a drain valve.

  1. Attach primer to centrifugal pump or skid.
    • Use non-collapsible hose or flexible tubing to connect primer suction inlet to pump.
  2. Install cut-off valve between the primer suction inlet and pump.
  3. Close cut-off valve immediately after priming.
    • Make sure primer drain valve is closed.
    • A cut-off valve should be used at the pump discharge to prevent air from being drawn through the discharge line while priming.
    • DP5 - 2”, 3”, 4”
    • DP7 - 4”, 5”, 6”
    • DP9 - 6”, 8”, or Larger