Overfill Prevention Valves/Assemblies

A1100 Guardian Overfill Prevention Valve

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The Emco Wheaton A1100 is a two stage overfill prevention valve for use in both dual point and coaxial drop tubes, gravity feed systems. Easily installs in a new or existing drop tube assembly for economical compliance with EPA regulations. Internal float design to eliminate any chance of the floats getting caught on tank walls or the riser pipe as well as to prevent float damage during installation. Stick diverter and automatic spring loaded poppet retract from the flow path when the valve is not in operation, allowing for stick gauging at any tank level. Compatible with all standard fuels. Special variants are available for most bulk chemical applications.


Body: Aluminum
Floats: HDPE
Seals: Viton®
Viton® is a registered trademark
of Dupont Dow Elastomers.

Weight: 5.2 lbs.
Diameter: 3.76”
Length: 18.0”

CARB Approval 99-8
ULC MH21164
Florida DEP EQ-414

A1100 Testable Overfill Prevention Systems

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A1100 Guardian Dual Point Overfill Prevention Systems

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All assemblies are factory welded; bottom tube screws to top tube/valve assembly. No Epoxy

Assemblies are vapor tight and meet the EPA 40 CFR Part 63 requirements.

All standard A1100 variants are acceptable for use with up to E25 ethanol blend gasoline and B20 Biodiesel blends. Higher percentage ethanol or biodiesel require use of the “E” variant.

Available with anodized top tube (champagne color for easy identification), to prevent corrosion build-up between tube and riser pipe.