Johnson Pump Ultima Automatic Switch

Martin Motor Sports Verified independent store

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The Johnson Pump Ultima Automatic Switch uses patented Mirus field‑effect technology to sense water without relying on moving parts, exposed sensors, or mercury. Its fully sealed s olid‑state design resists corrosion and avoids false triggers from oil or debris, making it a reliable choice for automatic bilge control. Features Patented Mirus field‑effect detection No moving parts and no exposed sensors Totally sealed solid‑state electronics Not affected by oil or debris Mercury‑free construction Part number 189-36303 Show more