Diaphragm Water Pressure Pump - Threaded Head, 12V / 24V Options
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Compare the threaded connections and selected voltage
A diaphragm water-pressure pump with a blue threaded-port head, pressure-switch housing and four mounting feet. Select the required 12V or 24V version and compare the connections with your existing water system. The original photographs show two barb adapters and an inlet-strainer arrangement.
Specifications and options
| Voltage options | 12V DC / 24V DC; select the required version |
|---|---|
| Pictured model reference | NMDP42-G30-55 on the 12V unit |
| Pump-head arrangement | Threaded inlet and outlet; match the actual thread standard |
| Overall size references shown | 210 mm length × 125 mm width × 111 mm height |
| Mounting | Four feet; use the actual pump as the fixing template |
| Accessories pictured | Two barb adapters and an inlet strainer; confirm current supplied parts |
Photographed 12V unit: nameplate reference
| Label voltage | 12V |
|---|---|
| Label open-flow reference | 11.3 L/min / 3.0 GPM |
| Label maximum-current annotation | 7.5 A |
| Label pressure setting | 55 PSI |
Open flow and pressure setting are separate reference conditions. Current and circuit-protection requirements must match the actual supplied pump and its installation documentation.

Original overall size reference
Installation planning
Illustrative system layout
- Water tank
- Inlet strainer
- Pump IN → OUT
- Water outlets
Conceptual water path. Check the moulded IN/OUT markings and use the connection, mounting and electrical instructions for the actual supplied variant.
- Confirm the required DC voltage and compare the supplied pump label with your system.
- Choose an accessible supported location with clearance for hoses, strainer and mounting-foot fasteners.
- Match the thread standard and hose adapters, support the pipework and keep loads off the pump ports.
- Use the correct wiring and circuit protection from the supplied revision documentation. Check joints and pressure-switch operation during commissioning.
The pump label warns against pumping flammable liquids.
Contact ROQIFY for the exact variant nameplate, connection specification and mounting drawing before replacing an existing pump.
