Rule pump?
Sounds like a sensor type like this.
An internal computer chip cycles these pumps on every 2.5 minutes, then quickly shuts them down if no water is detected. Built-in strainer bases snap off to make cleaning easy. Completely submersible, rust-proof, corrosion-proof and ignition-protected. Three-way wiring enables connection to a switch for manual override or indicator light. Small 500gph pump is designed to handle spray and rainwater.
Built-In Switch: Yes, cycles every 2.5 min.
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