Rule Industries 39 ECO-Switch Automatic Bilge Pump Switch 12V DC

The Rule Industries 39 ECO-Switch is an air-operated automatic bilge pump control switch designed as an environmentally responsible alternative to traditional mercury-based float switches. Using simple air pressure mechanics, this automatic bilge switch reliably activates your bilge pump without any submerged electrical connections.

As bilge water rises, air compresses inside the attached air tube and triggers the switch to turn the pump on. When the water level drops, the pressure releases and the pump shuts off automatically. The switch is pre-set to activate at 57mm (ON) and deactivate at 25mm (OFF), providing precise bilge management without manual intervention.

Key Features:

• Mercury-free design — environmentally safe, non-toxic automatic bilge switch operation
• No submerged electrical connections — all wiring remains out of the water for enhanced safety
• No moving internal parts — reduces wear and improves long-term reliability
• Air pressure activation — simple, proven mechanism for consistent automatic operation
• Maximum current rating: 20 amps
• Voltage: 12V DC
• Pre-set switch levels: ON at 57mm / OFF at 25mm
• Includes 3-meter air tube for flexible bilge installation
• Switch dimensions: 155mm L × 75mm W × 48mm H (6.10" × 2.95" × 1.89")
• Bell dimensions: 100mm L × 60mm W × 30mm deep

The Rule 39 ECO-Switch is a dependable drop-in upgrade from conventional bilge float switches, offering improved corrosion resistance and zero risk of electrical short from water contact — ideal for any 12V marine bilge pump installation.