Rule – Ayamar Náutico

Rule Mercury Free ECO Switch Bilge Pump Control Switch 24V

Lorie — Sat, 21 Feb 2026 12:10:41 +0000

The Rule 39-24 Mercury Free ECO Switch is a 24V automatic bilge pump control switch designed as an ecological and reliable alternative to traditional float switches. Instead of a mechanical float mechanism, the ECO Switch operates using air pressure. As water rises in the bilge, air inside the attached sensing tube is compressed, activating the switch and starting the pump. When the water level drops, pressure decreases and the pump switches off.

This design contains no moving internal parts and no submerged electrical connections, as all wiring remains outside the water. The mercury-free construction makes it environmentally sound while reducing the risk of mechanical jamming caused by debris. The ECO Switch is suitable for controlling non-automatic bilge pumps within appropriate amperage limits and provides dependable automatic operation in 24V marine electrical systems. It offers a practical solution for vessels requiring enhanced reliability in contaminated or debris-prone bilge environments.

Technical Specifications

Type: Air pressure activated switch
Voltage: 24V DC
Mercury-free design
No submerged electrical connections
No moving internal parts
Datasheet

Application

Automatic control for non-automatic bilge pumps
24V marine electrical systems
Suitable for debris-prone bilges

Rule-A-Matic Plus Float Switch 40A for Bilge Pumps

Lorie — Sat, 21 Feb 2026 12:00:07 +0000

The Rule-A-Matic Plus 40A is a heavy-duty float switch designed to automatically control non-automatic bilge pumps in marine installations. Rated for pumps drawing up to 20 amps, it activates the pump when water rises in the bilge and switches it off once the water has been evacuated.

This model features a fully integrated, impact-resistant protective cover that helps prevent debris intrusion and reduces the risk of jamming in contaminated bilge environments. It is equipped with 14-gauge, abrasive-resistant, marine-grade blocked wire for enhanced durability and reliability. A built-in test feature allows quick functional verification without lifting the float manually.

Suitable for a wide range of bilge pumps, typically from 360 GPH to 4000 GPH depending on current draw, the Rule-A-Matic Plus 40A provides increased amperage capacity compared to the standard 35A model. The unit includes a removable base for servicing and is backed by a 2-year manufacturer warranty.

Technical Specifications

Type: Mechanical float switch
Maximum Pump Load: 20 amps
Protective Cover: Integrated, impact-resistant
Wiring: 14-gauge marine-grade blocked wire
Built-in test feature
Removable base for cleaning
Datasheet

Application

Automatic control for non-automatic bilge pumps
Suitable for 12V marine bilge systems (within 20A limit)

Rule-A-Matic Float Switch 35A for Bilge Pumps

Lorie — Sat, 21 Feb 2026 11:47:22 +0000

The Rule-A-Matic 35A is a float switch designed to automatically control non-automatic bilge pumps in marine installations. Suitable for pumps drawing up to 14 amps, it activates the pump when water rises in the bilge and switches it off once the water level has been reduced.

Featuring a mercury-free snap switch mechanism tested to over one million cycles, the 35A model provides reliable long-term operation. The unit includes a removable base for easy cleaning and servicing, allowing debris removal without dismantling the wiring. Marine-grade blocked wiring enhances durability in harsh bilge environments.

The Rule-A-Matic 35A is compatible with a wide range of bilge pumps, typically from 360 GPH up to 4000 GPH, depending on amperage draw. Interchangeable mounting bases (shared with model 37A) simplify replacement or upgrade installations. This model is backed by a 2-year manufacturer warranty.

Technical Specifications

Type: Mechanical float switch
Maximum Pump Load: 14 amps
Switch Type: Mercury-free snap switch
Marine-grade blocked wire
Removable base for cleaning
Datasheet

Application

Automatic control for non-automatic bilge pumps
Suitable for 12V marine bilge systems (within 14A limit)

Rule LoPro Automatic Bilge Pump 900 GPH (3407 LPH) 12V

Lorie — Sat, 21 Feb 2026 11:01:23 +0000

The Rule LoPro LP900S is a 12V automatic bilge pump rated at 900 GPH (3407 LPH), specifically engineered for shallow bilges and tight installation areas. Its low-profile design allows mounting in confined compartments where traditional bilge pumps may not fit.

The LP900S offers multiple operational modes to suit different onboard requirements. It can be configured to activate automatically at either 2″ (5 cm) or 1.3″ (3.25 cm) water level, depending on installation preference. An additional automatic timed mode checks for water by briefly activating the pump every 2.5 minutes. A fail-safe back-up feature protects against continuous run conditions.

The pump includes a fully rotating discharge body for flexible hose routing and is supplied with multiple discharge port options to accommodate various plumbing configurations. It can be mounted horizontally or vertically to adapt to bilge layout. A built-in Thermal Cut-Off (TCO) protects both pump and vessel, while marine-grade blocked wiring, ignition protection, and CE and ISO 8849 certification ensure compliance with marine safety standards.

Designed for quiet operation with minimal vibration, the LoPro series provides efficient bilge water removal while maintaining reliable performance in demanding marine environments.

Technical Specifications

Flow Rate: 900 GPH (3407 LPH)
Voltage: 12V DC
Operation: Automatic (multi-mode)
Activation Levels: 2″ (5 cm) or 1.3″ (3.25 cm) selectable
Automatic Timed Mode: 2.5-minute check cycle
Built-in Thermal Cut-Off (TCO)
Ignition protected
Horizontal or vertical mounting
Technical Drawing

Application

Shallow bilge compartments
Tight installation spaces
Petrol and diesel engine compartments (ignition protected)

Rule-Mate Fully Automated Bilge Pump 500 GPH (1893 LPH) 12V

Lorie — Sat, 21 Feb 2026 10:48:25 +0000

The Rule-Mate RM500B is a 12V fully automated bilge pump rated at 500 GPH (1893 LPH), designed to provide reliable, sensor-controlled bilge water removal without the need for a separate float switch. Equipped with Auto Sense Intelligence, the internal water level sensor automatically activates the pump when water reaches approximately 2 inches (5 cm) and switches off when the level drops to approximately 3/8 inch (0.9 cm).

This model incorporates an optimized impeller delivering up to 10% higher flow compared to previous generations at similar amperage draw. A built-in Thermal Cut-Off (TCO) provides additional protection for both pump and vessel. For 500–1100 GPH models, including the RM500B, features include backflow prevention to reduce residual water in the bilge, hidden air vents to minimise airlock in complex plumbing installations, and a threaded discharge outlet for easier installation and maintenance.

If the internal sensor becomes fouled by debris or contaminated bilge water, the integrated back-up feature prevents continuous run conditions by reverting to a timed 2.5-minute cycle mode, protecting the vessel’s battery while maintaining automatic operation. The compact housing (approximately two-thirds the footprint of previous comparable models) allows installation in tighter bilge spaces.

Technical Specifications

Flow Rate: 500 GPH (1893 LPH)
Voltage: 12V DC
Operation: Fully automatic (integrated level sensor)
Activation Level: approx. 2 in (5 cm)
Shut-Off Level: approx. 3/8 in (0.9 cm)
Threaded discharge outlet
Built-in Thermal Cut-Off (TCO)
Ignition protected
Fully submersible

Application

Automatic bilge water removal
Suitable for petrol and diesel engine compartments (ignition protected)
Standalone automatic installation without external float switch

Rule Non-Automatic Bilge Pump 1100 GPH (4164 LPH) 12V

Lorie — Sat, 21 Feb 2026 10:27:26 +0000

The Rule 27DA is a 12V non-automatic bilge pump rated at 1100 GPH (4164 LPH), designed for efficient removal of nuisance water from marine bilge compartments. As part of the Rule Standard Bilge Pump range, it features a compact, high-efficiency motor with stainless steel shaft and marine-grade blocked wiring for durability in harsh marine environments.

This pump is fully submersible and ignition protected, making it suitable for installation in petrol-powered vessels. It incorporates a snap-lock strainer base for easy cleaning and maintenance access, as well as a vented impeller housing to reduce the risk of airlock. Built-in Thermal Cut-Off (TCO) protection helps safeguard both pump and vessel in case of overload.

The 360–1100 GPH models, including the 1100 GPH version, feature backflow prevention to help reduce water returning into the bilge from the discharge line. The Rule 27DA is supplied as a standalone pump; automatic operation requires a separate float switch or panel switch. The pump meets or exceeds CE and ISO 8849 standards and is NMMA listed.

Technical Specifications

Flow Rate: 1100 GPH (4164 LPH)
Voltage: 12V DC
Operation: Non-automatic (switch required)
Fully submersible
Ignition protected
Stainless steel shaft
Built-in Thermal Cut-Off (TCO)
Technical Drawing

Application

Marine bilge water removal
Suitable for petrol and diesel engine compartments (ignition protected)

Rule Non-Automatic Bilge Pump 500 GPH (1893 LPH) 12V

Lorie — Sat, 21 Feb 2026 10:21:55 +0000

The Rule 25DA is a 12V non-automatic bilge pump rated at 500 GPH (1893 LPH), designed for efficient removal of nuisance water from marine bilge compartments. As part of the Rule Standard Bilge Pump range, it features a compact, high-efficiency motor with stainless steel shaft and marine-grade blocked wiring for durability in harsh marine environments.

The 360–1100 GPH models, including the 500 GPH version, feature backflow prevention to help reduce water returning into the bilge from the discharge line. The Rule 25DA is supplied as a standalone pump; automatic operation requires a separate float switch or panel switch. The pump meets or exceeds CE and ISO 8849 standards and is NMMA listed.

Technical Specifications

Flow Rate: 500 GPH (1893 LPH)
Voltage: 12V DC
Operation: Non-automatic (switch required)
Fully submersible
Ignition protected
Stainless steel shaft
Built-in Thermal Cut-Off (TCO)
Technical Drawing

Application

Marine bilge water removal
Suitable for petrol and diesel engine compartments (ignition protected)