In-stock parts
Order by 2PM MST
In-stock parts
Order by 2PM MST
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2045 West Buckeye Road
Phoenix AZ 85009
United States
The ProTek DP7 hand diaphragm primer removes air from a centrifugal pump’s priming line so water can rise into the pump before operation. Its manually operated handle offers a straightforward priming method for water-transfer equipment without adding an electric primer motor.
Choose the DP7 for centrifugal pump systems using 4-, 5-, or 6-inch suction pipe. This pipe-size selection is separate from the primer’s own threaded connection. Check the pump layout, suction-line length, and available mounting space before ordering.
A lever and connecting rod move the rubber diaphragm, while two check valves direct airflow through the primer. The aluminum-alloy body keeps the unit portable, and the drain valve lets you empty retained fluid after use.
| Feature | Benefit |
|---|---|
| Hand-operated diaphragm | Prime the centrifugal pump without a powered primer drive. |
| Aluminum-alloy body | Provides a lightweight primer for pump or skid mounting. |
| Drain valve | Allows fluid to be cleared from the unit after use. |
| Specification | Value |
|---|---|
| Manufacturer part number | DP7 |
| Product function | Hand-operated centrifugal pump primer |
| Selected suction pipe sizes | 4, 5, and 6 inches |
| Body and diaphragm | Aluminum-alloy body; rubber diaphragm |
| Unit dimensions, without handle | 10-7/8 × 9-5/16 × 12-1/4 inches |
| Primer connection | 3/4-inch NPT internal thread; 1-1/2-inch NPT external thread |
The DP7 primes a separate centrifugal pump; it does not replace that pump. Provide an airtight priming line and enough access to operate the handle and reach the drain.
| Component | Selection or use |
|---|---|
| Centrifugal pump or skid | Mount the primer securely in an accessible position. |
| Priming hose or tubing | Use non-collapsible hose or flexible tubing between the primer inlet and pump. |
| Cut-off valves | Provide a valve in the priming line and a pump-discharge cut-off to prevent air entering during priming. |
| Check | What to confirm |
|---|---|
| System fit | Confirm suction-pipe size, primer thread connection, mounting space, and handle clearance. |
| Installation supplies | Check the hose, fittings, valves, and mounting hardware needed for your installation. |
| Operation | Close the primer drain before priming. Close the priming-line cut-off immediately after priming. |
| Maintenance | Remove debris beneath the diaphragm and drain retained fluid after each use. Inspect for suction leaks if priming fails. |
Need help selecting a primer? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your pump model, suction-pipe size, and mounting arrangement.
| Model Number | DP |
|---|---|
| Weight | 18.23 lb |