Attwood Marine Sahara Automatic Bilge Pump, 500 GPH, 12V, Quicksilver Connectors

Overview

The Attwood Marine 4505ST1 is a Sahara S500 automatic bilge pump for 12V systems with a Quicksilver connector, rated at 500 GPH at open flow and 350 GPH at 3.3 feet of head. It fits a 3/4 inch I.D. discharge hose and uses a built-in automatic switch, so it suits boats that need a compact pump with automatic operation already built in.

The housing is about 5-1/2 inches long, 3-1/4 inches wide, and 4 inches high, which helps when bilge space is limited. This pump is for clearing standing bilge water, not fuel, oil, or fast flooding from heavy weather or hull damage. The pump body is sealed and submersible, but the electrical connection still needs to stay out of the water during installation.

Key features

• 12V automatic bilge pump in the Sahara S500 class with a built-in switch and manual test knob
• 500 GPH open-flow rating and 350 GPH at 3.3 feet of head
• Quicksilver connector version for boats already rigged with that connector style
• Uses 3/4 inch I.D. hose and a 2 amp fuse for this pump model
• Compact body at about 5-1/2 x 3-1/4 x 4 inches for tighter bilge areas
• Mercury-free switch and 316 stainless steel motor shaft

Installation and fit

This pump is usually mounted on a flat pad at the lowest practical point in the bilge, with the outlet aimed toward the transom. For the best result, the discharge hose should rise steadily to the thru-hull rather than dipping along the way, and the float end of the pump should sit level with or slightly above the outlet end.

For replacement work, the main checkpoints are straightforward: confirm a 12V circuit, a 3/4 inch discharge line, room for the pump body, and a harness that matches the Quicksilver connector on this version. That connector detail matters on boats where keeping the existing rigging layout is preferable to reworking the bilge pump connection.

Use on board

This pump is a good match for runabouts, skiffs, bass boats, and other boats with a smaller bilge compartment and a 3/4 inch discharge setup. It also makes sense when you want automatic bilge protection in the 500 GPH range without adding a separate float switch assembly for the same basic job.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.