---
product_id: 4139220
title: "Rule 35A Marine Rule-A-Matic Switch - 12V Automatic Bilge Pump Switch - Mercury Free, Durable, Reliable, and Easy to Install"
brand: "rule"
price: "B/.132"
currency: PAB
in_stock: true
reviews_count: 8
category: "Rule"
url: https://www.desertcart.com.pa/products/4139220-rule-35a-marine-rule-a-matic-switch-12v-automatic-bilge
store_origin: PA
region: Panama
---

# Easy, hassle-free installation 12V automatic activation Mercury-free, corrosion-resistant Rule 35A Marine Rule-A-Matic Switch - 12V Automatic Bilge Pump Switch - Mercury Free, Durable, Reliable, and Easy to Install

**Brand:** rule
**Price:** B/.132
**Availability:** ✅ In Stock

## Summary

> 🛥️ Rule your bilge, rule the waves—effortless protection on autopilot!

## Quick Answers

- **What is this?** Rule 35A Marine Rule-A-Matic Switch - 12V Automatic Bilge Pump Switch - Mercury Free, Durable, Reliable, and Easy to Install by rule
- **How much does it cost?** B/.132 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/4139220-rule-35a-marine-rule-a-matic-switch-12v-automatic-bilge)

## Best For

- rule enthusiasts

## Why This Product

- Trusted rule brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Simplicity:** Quick, straightforward installation saves time and gets you back on the water faster.
- • **Built to Brave the Elements:** Marine-grade, mercury-free design resists corrosion for long-lasting reliability.
- • **Hands-Free Water Management:** Automatically triggers your bilge pump at rising water levels—no manual checks needed.
- • **Dependable Performance, Always:** Engineered to activate precisely when needed, whether docked or offshore.
- • **Peace of Mind for Every Boater:** Protect your vessel effortlessly with a trusted switch designed for real-world marine conditions.

## Overview

The Rule 35A Marine Rule-A-Matic Switch is a 12V automatic bilge pump float switch designed for reliable, hands-free water level control. Its mercury-free, corrosion-resistant marine-grade construction ensures durability in harsh saltwater and freshwater environments. Easy to install with clear instructions, it activates your bilge pump precisely when needed, providing boaters with dependable protection against flooding and water damage.

## Description

Ensure your boat stays dry and protected with the Rule 35A Marine Rule-A-Matic Switch, a trusted solution for automatic bilge pump activation. Designed for seamless operation, this float switch automatically engages your bilge pump when water levels rise, providing hands-free water management and reducing the risk of flooding. Built with marine-grade materials, the mercury free Rule 35A is resistant to corrosion and harsh conditions, ensuring long-term durability and reliable performance in saltwater and freshwater environments. Its easy installation process makes it a practical choice for boat owners looking for a dependable, no-fuss solution to bilge water control. Whether you're a casual boater or a seasoned mariner, the Rule 35A Automatic Bilge Pump Switch offers peace of mind by keeping your bilge dry and your vessel safe. Pair it with a compatible 12V bilge pump for effortless water management on every journey.

Review: Works great - Works great
Review: Bad experience requires wise decisions - This device is top of the line, at least that is my experience. Though recently I had some problems when at the same time a 2000 GPH pump failed within two months of use even though it has a four years warranty. desertcart Rep told me that I would need to contact the manufacturer because my time warranty through desertcart would be only 30 days and from then on...I would need to contact the manufacturer. ( somewhere in China ) I understand desertcart policy, but honestly I expected more from this Co. And then it occurred that a cheap float switch failed 48 hours after installation. But it happens that the cost of installation is at least three times the cost of the device. So, I decided to go for RULE....to be on the safe side. This is my recommendation. to whoever needsto replace a damaged float switch that are always located as deep and unaccesible as the boat builder could install them....

## Features

- Reliable Automatic Bilge Control: The Rule 35A Marine Rule-A-Matic Switch ensures automatic activation of your bilge pump when water levels rise, preventing manual checks and safeguarding your vessel against unexpected water accumulation.
- Durable, Marine-Grade Construction: Built to withstand harsh marine environments, this bilge pump switch is mercury free and features corrosion-resistant components, including a robust housing and high-quality wiring, ensuring long-lasting performance.
- Easy Installation for Hassle-Free Use: Designed for straightforward setup, the Rule-A-Matic switch integrates seamlessly into your boat's bilge system. With simple wiring and clear instructions, installation is quick and convenient.
- Dependable Performance in Every Condition: Engineered for reliability, this float switch activates your bilge pump precisely when needed, ensuring smooth operation whether you’re at the dock or on open water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Rule |
| Color | White |
| Material | Plastic |
| Power Source | Corded Electric |
| Product Dimensions | 3.5"L x 5"W x 8.25"H |
| Style | Bilge Pumps Switches |

## Product Details

- **Brand:** Rule
- **Color:** White
- **Material:** Plastic
- **Style:** Bilge Pumps Switches
- **Product Dimensions:** 3.5"L x 5"W x 8.25"H
- **Power Source:** Corded Electric
- **Item Weight:** 4 ounces
- **Voltage:** 12 Volts (DC)
- **Global Trade Identification Number:** 00042237095435
- **Manufacturer:** Rule

## Images

![Rule 35A Marine Rule-A-Matic Switch - 12V Automatic Bilge Pump Switch - Mercury Free, Durable, Reliable, and Easy to Install - Image 1](https://m.media-amazon.com/images/I/41fUsHCz1QL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by S***R on December 15, 2025*

Works great

### ⭐⭐⭐⭐⭐ Bad experience requires wise decisions
*by J***. on June 3, 2021*

This device is top of the line, at least that is my experience. Though recently I had some problems when at the same time a 2000 GPH pump failed within two months of use even though it has a four years warranty. Amazon Rep told me that I would need to contact the manufacturer because my time warranty through Amazon would be only 30 days and from then on...I would need to contact the manufacturer. ( somewhere in China ) I understand Amazon policy, but honestly I expected more from this Co. And then it occurred that a cheap float switch failed 48 hours after installation. But it happens that the cost of installation is at least three times the cost of the device. So, I decided to go for RULE....to be on the safe side. This is my recommendation. to whoever needsto replace a damaged float switch that are always located as deep and unaccesible as the boat builder could install them....

### ⭐⭐⭐⭐⭐ Easy to use
*by D***L on November 18, 2025*

Very easy to install and to power. Very fast to activate pump. Installed it in my bilge area and has not failed me

## Frequently Bought Together

- Rule 35A Marine Rule-A-Matic Switch (Mercury Free)
- Rule High-Performance 1500GPH, 12 Volt Water Pump for Boats - Bilge Pump with Pressure Switch, Submersible Pump, and Float Switch - Ideal for Marine Accessories, Boating supplies, and Bilge Pumps
- Rule 2000 GPH Bilge Pump 12V - Submersible Marine Boat Accessory with 1-1/8" Discharge, Anti-Airlock, Reliable Ignition Protection, Silent Operation, Easy-Clean Strainer - Rust/Corrosion Resistant

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**Shop now:** [https://www.desertcart.com.pa/products/4139220-rule-35a-marine-rule-a-matic-switch-12v-automatic-bilge](https://www.desertcart.com.pa/products/4139220-rule-35a-marine-rule-a-matic-switch-12v-automatic-bilge)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-12*