• Spark-free. Closed-tube mercury switch sealed in a polyurethane foam float. • Damage-proof. Foam cushions high-speed G-forces of performance boats and protects mercury switch from damage. • Can’t jam. Case protects the float, preventing switch failure from foreign materials lodging on or under the float. • Won’t stick. No close clearances. • Can’t come apart or waterlog. • Prevents pump cycling. Case dampens wave action of bilge water. • Manual testing. External shaft makes checking operation simple.
