Fimco High Flo 12V Demand Diaphragm Pump — 4.5 GPM, 60 PSI, chemically resistant upgrade

Fimco's High Flo 12V Demand Diaphragm Pump is a self-priming, 4.5 GPM electric pump with a 60 PSI max and built-in demand shutoff for reliable spot or broadcast spraying.

The High Flo Upgrade pump from Fimco is engineered to deliver steady flow and long service life in agricultural and landscaping sprayer systems. Designed for 12-volt operation, this diaphragm-style unit combines chemically resistant components, a thermostatically cooled motor, and built-in safety features so you can handle a range of liquid applications — including herbicide use where compatible — without frequent maintenance. It replaces several legacy Fimco pump part numbers and includes protection against common field stresses like running dry or pressure spikes.

How does the pump maintain pressure and save battery life?

This model uses an integrated demand switch that stops the motor once the preset maximum pressure is reached, then restarts when pressure falls. That automatic cycling reduces continuous motor run time and reduces battery drain compared with non-demand pumps. The pump also has internal check valves to hold pressure and prevent backflow when the motor is off.

• Automatic demand switch stops pump at maximum pressure (60 PSI)
• Built-in check valves retain pressure and prevent backflow
• Reduced runtime lowers 12V battery load during intermittent spraying

What makes this pump durable for chemical and field use?

Fimco engineered the High Flo with elastomers and seals that resist degradation from many common agricultural chemicals. The motor is fan-cooled internally to keep temperatures down during sustained use, and the diaphragm design tolerates brief dry running without immediate failure. Inline fuse protection and a ball bearing drive add mechanical and electrical resilience in tough environments.

• Chemically resistant elastomers for extended seal life
• Internal fan cooling for consistent performance under load
• Self-priming and safe to run dry for short periods without damage
• Inline fuse and ball bearing drive protect motor and electronics

Is this pump easy to install and compatible with existing systems?

The pump uses quick-connect port fittings to speed installation and reduce leak points. It is designed as a drop-in upgrade for multiple Fimco pump part numbers, so it fits common mounting and plumbing arrangements in sprayer setups. Quick attach fittings also simplify swapping hoses or servicing the unit in the field.

• Quick-connect ports for fast hooking to hoses and fittings
• Replacement for several legacy Fimco pump part numbers
• Standard 12V electrical connection for vehicle and utility battery systems

Can I use this pump with herbicides like Roundup?

The High Flo pump is compatible with many herbicide solutions when those formulas are approved for diaphragm-style pumps. Use manufacturer guidance for any chemical and always flush the system after use to prevent concentration buildup and prolong component life. Avoid corrosive or solvent-based products not rated for elastomer seals.

• Compatible with many herbicides if labeled for diaphragm pumps
• Flush system after chemical use to protect seals and valves
• Avoid materials not rated for chemical resistance

Who is this for: The Fimco High Flo 12V Demand Diaphragm Pump suits farmers, landscapers, and contractors who need a compact, dependable sprayer pump that balances high flow with energy efficiency. It’s ideal for users upgrading older Fimco units, building a 12V mobile sprayer, or anyone who wants a robust pump able to handle intermittent spot-spraying and broadcast applications while resisting common agricultural chemicals. Backed by a two-year warranty, it’s a practical choice for demanding fieldwork where uptime matters.