Flojet 04300-501 115V Diaphragm Pump – 3.5 GPM, 45 PSI
The Flojet 04300-501 is a compact, self-priming diaphragm pump designed to move water and similar fluids reliably in a wide range of settings, from utility and cleaning setups to small-scale fluid handling systems. Running on standard 115V AC power, it draws in liquid on its own without needing to be pre-filled, which makes installation and everyday use straightforward. Its quad-piston design keeps flow steady and consistent, delivering up to 3.5 gallons per minute against pressures up to 45 PSI.
Built with a durable polypropylene housing, a flexible Santoprene diaphragm, and Viton check valves, this pump is made to handle repeated use without breaking down under normal operating conditions. An integrated automatic pressure switch takes the guesswork out of operation, starting and stopping the pump on its own as pressure demand changes, so it can be left to run a system without constant manual attention. With 1/2" hose barb ports, it connects easily into most existing plumbing or tubing setups, making it a practical drop-in option for anyone replacing an older pump or building a new fluid transfer system from scratch.
Whether it's supporting a portable water supply, feeding a spray or wash-down system, or moving liquids around a workshop or utility trailer, the 04300-501 offers dependable mid-range performance without unnecessary complexity. It's a straightforward, no-frills pump built for people who need consistent flow and pressure without having to think too hard about setup or maintenance.
Key Features
- Self-priming operation, no manual pre-fill required
- Quad four-piston design for steady, consistent flow
- Built-in automatic pressure switch
- Durable polypropylene pump body
- Santoprene diaphragm for long service life
- Viton check valves for chemical and wear resistance
- Compact, lightweight footprint for flexible mounting
Applications
- Portable water supply and transfer systems
- Utility and workshop fluid transfer
- Wash-down and spray applications
- Tank-to-tank or tank-to-fixture water delivery
- Replacement pump for existing 115V systems
- General-purpose light fluid handling (non-marine and marine use)
Specifications
- Voltage: 115V AC
- Flow Rate: Up to 3.5 GPM
- Max Pressure: 45 PSI
- Amperage: 1.5 Amps
- Port Size: 1/2" hose barb
- Pump Body Material: Polypropylene
- Diaphragm Material: Santoprene
- Check Valve Material: Viton
- Pressure Switch: Automatic, built-in
Frequently Asked Questions
Q: Can the Flojet 04300-501 run dry without damage?
A: Yes, the diaphragm design allows brief dry running without harming the pump, though it's best to avoid extended dry operation.
Q: Is this pump suitable for continuous duty use?
A: No, it's designed for intermittent duty. Running times should be balanced with rest periods to avoid overheating the motor.
Q: What kind of liquids can this pump handle besides water?
A: It can handle water-like and moderately viscous fluids, making it suitable for more than just plain water in general fluid transfer tasks.
Q: Does the pump require priming before use?
A: No, it's self-priming, so it can draw fluid on its own once connected and powered.
Q: What size hose or tubing works with this pump?
A: It uses 1/2" hose barb ports, so 1/2" ID hose or tubing connects directly without adapters.
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