Rule-A-Matic® Plus™ Float Switch

The Rule-A-Matic® Plus Float Switch (Model 40A) is a fully integrated automatic bilge pump control designed for marine vessels and boating applications. This float switch automates water detection and pump activation, eliminating the need for manual operation and providing continuous protection against hull water accumulation in real-world boating conditions.

Built with a rugged, impact-resistant cover that resists debris and mechanical jamming, the Rule-A-Matic Plus features 14-gauge marine-grade wire rated for high abrasion resistance in saltwater and freshwater environments. The switch accommodates pumps drawing up to 20 amps, making it compatible with a wide range of standard bilge pump systems. An integrated test feature allows operators to verify switch functionality without relying on water activation, ensuring reliable performance before an emergency occurs. A 2-year warranty backs this model against manufacturing defects.

This float switch serves weekend fishermen, cruisers, and offshore anglers who require passive water management systems that function reliably in harsh marine conditions. It's equally suited for permanent galley installations and emergency backup pump circuits, where consistent performance matters more than active monitoring. The 40A model is particularly effective in smaller to mid-size hull applications where water intrusion is a manageable but critical concern.

Float switches remain the marine industry standard for bilge automation because they operate independently of electrical controls and respond immediately to rising water levels. The Rule-A-Matic Plus advances this proven design with reinforced construction and user-accessible testing, reducing service calls and enhancing operational confidence during extended trips.