Johnson Pump Ultima Automatic Switch

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 solid‑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

Product availability varies between locations, and some products are only available online. Please contact your nearest Martin Motor Sports here for availability.