Keep your marine gray water system running smoothly with the Rule 800 GPH Legacy Replacement Pump (Model 20RSB). Specifically designed as a direct drop-in replacement for the classic Rule 97A and 98A shower drain boxes, this 12V pump ensures you don’t have to replace your entire sump system when the motor reaches the end of its life.

Built with Rule’s legendary standards for durability and moisture protection, the 20RSB delivers high-capacity flow in a compact, easy-to-install package.

Key Features & Benefits

• Perfect Compatibility: Engineered specifically to fit Legacy Rule 97A and 98A shower drain systems.

• High-Flow Performance: Moves up to 800 Gallons Per Hour (GPH), ensuring your shower sump never overflows

• Reliable 12V Power: Optimized for marine electrical systems with low amp draw to preserve battery life.

• Quiet & Efficient: Features a smooth-running motor that operates quietly beneath the cabin floor.

• Rugged Construction: Ignition-protected and built with a stainless steel shaft to withstand the harsh marine environment.

• Direct Drop-In Fit: Designed to match the exact footprint and mounting requirements of the original pumps found in 97A and 98A enclosures, ensuring a straightforward installation process.

• Higher Flow Efficiency: At 800 GPH, this pump provides ample capacity to handle high-flow shower heads, preventing water backup and potential overflows in the drain box.

• Marine-Grade Build: Features a high-impact plastic housing and a stainless steel shaft for long-term resistance to soaps, hair, and chemicals typically found in greywater systems.

• Thermal Protection: Includes an internal thermal cut-off to prevent motor burnout in the event of a clog or dry-run situation.

Installation Note

This is a replacement pump only. It is intended for users who already have a functioning shower box but have experienced a motor failure. Ensure your existing float switch is operational, as this pump relies on the box's internal switch for automatic activation.

What’s In The Box?

• (1) Rule 800 GPH 12V Replacement Pump

• (1) Set of tinned wire leads for marine-grade electrical connections

Technical Specifications

Why Choose the Rule 20RSB?

Replacing a shower drain pump can be a cramped, difficult job. The Rule 20RSB simplifies the process by matching the exact footprint and specifications of your original Legacy equipment. Instead of replumbing your entire drain box, simply swap the pump and get back to enjoying your time on the water.

Note: This is a replacement pump motor only. It is intended for use inside existing Rule shower sump boxes.