Everflo 12V Diaphragm Pump EF5500-BOX — 5.5 GPM, 1/2" FNPT, Self-Priming (8') with Viton Valves

Everflo EF5500-BOX is a 12V on-demand diaphragm pump delivering up to 5.5 GPM with a 1/2" FNPT outlet, self-priming up to 8' and built for sprayer and fluid-transfer tasks.

The Everflo EF5500-BOX pairs rugged materials and practical features to give reliable flow for spot and broadcast spraying, tank transfers, and general fluid handling. Built around a fiberglass-reinforced polypropylene manifold, a Santoprene diaphragm and Viton valves, this pump balances chemical resistance and durability. It includes an automatic pressure switch and Honeywell micro switch to minimize cycling and conserve battery power, while a standard mounting pattern simplifies replacement installations.

How much flow and pressure can I expect from the EF5500-BOX?

The EF5500-BOX supplies up to 5.5 gallons per minute and is rated to handle pressures up to 60 PSI, suitable for many spraying and transfer tasks. Its on-demand operation raises output only when required, preventing unnecessary motor runtime.

• Maximum output: 5.5 GPM for steady application rates.
• Maximum working pressure: 60 PSI for heavier spray patterns.
• On-demand switch reduces idling and conserves energy.

Can this pump prime itself and how is it mounted?

The pump self-primes up to eight feet, letting you lift fluid from a lower source without manual priming. It uses a standard mounting pattern so it will fit most sprayer tanks and replacement brackets, making swaps straightforward.

• Self-priming capability: up to 8' vertical lift.
• Standardized mounting pattern for simple replacement.
• Compact footprint helps fit in limited tank spaces.

Is the EF5500-BOX suitable for chemicals and sanitizing solutions?

Yes — the pump’s Santoprene diaphragm and Viton valves offer broad chemical resistance for many agricultural and sanitizing fluids. After using corrosive or sticky solutions, flush the pump thoroughly to avoid residue buildup and maintain long-term performance.

• Viton valves resist degradation from many chemicals.
• Santoprene diaphragm balances flexibility and chemical compatibility.
• Recommended: flush with clean water after corrosive use.

What electrical and accessory considerations should I plan for?

The EF5500-BOX runs on a 12V supply and relies on a separate 12V wire harness (sold separately) for installation. It incorporates a Honeywell micro switch and a pressure switch that cycles slowly to reduce wear on both motor and switch contacts.

• Power: 12V DC — ensure proper battery capacity for runtime needs.
• Wire harness: 12V harness required (not included).
• Controls: built-in micro switch and pressure switch for automatic cycling.

Who is this for: The Everflo EF5500-BOX is aimed at users who need a dependable, mid‑flow diaphragm pump for agricultural sprayers, spot- and broadcast-spraying setups, and general fluid transfer where chemical compatibility and simple replacement matter. It suits contractors, farmers, landscapers, and equipment owners replacing worn pumps or upgrading to a self-priming, on-demand solution.