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Low-cost method to start backup equipment or trip an alarm or relay. 1/8" air/water line hose barb, connects normally open or normally closed. It is a high quality snap-action (single-pole double-throw) switch will carry up to 3 amps at 120V. For low-pressure applications (do not exceed 40 psi). Factory set at 30" H2O. UL-listed. Moisture-resistant. Only 1.5" long.