Attwood Shower Sump Pump System - 12V - 500 GPH

The Attwood Shower Sump Pump System – 12V – 500 GPH is a purpose-built marine bilge and shower sump solution designed for cruisers, liveaboards, and serious recreational boaters who demand reliable water removal below deck. After years on the water, you know that persistent moisture and standing water aren't just uncomfortable—they invite mildew, corrosion, and structural damage to your vessel. This 500 GPH pump system addresses that problem head-on, delivering the flow rate and dependability needed to keep your cabin dry and your boat's interior protected from the elements.

The Attwood Shower Sump Pump System operates on 12-volt DC power, a standard configuration for most vessels, and moves 500 gallons per hour—enough capacity to handle shower water, bilge seepage, and minor cabin moisture without lag. The system features a snap-fit lid design that simplifies both installation and routine maintenance; you can remove the cover in seconds for cleaning, inspection, or filter access without disconnecting plumbing or electrical lines. The standard-size sump basin offers fast water flow both into and out of the reservoir, minimizing pooling and ensuring efficient pump engagement whenever water levels rise.

This pump system is ideal for galley and head drain applications, as well as general bilge management on sailboats, fishing boats, and cabin cruisers in the 25–45-foot range. The compact footprint—9 inches wide by 11 inches tall and weighing just 2.7 pounds—fits easily in confined engine compartments, lazarettes, or under-cabin spaces where space is at a premium. Attwood's proven marine-grade construction ensures years of salt-air resistance and consistent performance, making this sump pump a trusted choice for boaters who value dry cabins and reliable equipment when conditions get rough.