Overview

The Attwood Marine 4801-7 is a 12V automatic bilge switch that uses electronic sensing to activate a bilge pump when water reaches the switch and shut the pump off once the water is cleared. It is rated for pump loads up to 15 amps and comes with a 36 inch wire lead, so it fits many 12V bilge pump circuits where you want automatic operation without relying on a mechanical float switch.

This is the switch only, not the pump. Because it uses solid-state sensing and has no moving parts, it avoids the sticking and wear that can show up with float-style switches over time. The sealed electronics, chemical-resistant housing, and stainless steel components make sense in bilge spaces where water, foam, sludge, and fuel or oil residue are part of real use on board.

Mounting is flexible enough for tight bilge layouts. The switch can be installed on the bilge floor, on a stringer wall, or alongside a compatible pump basket, which helps when you are replacing an older switch and want to keep the sensing point low in the hull.

Key features

• 12V automatic bilge switch for pump circuits up to 15 amps
• Electronic sensing reads bilge water and helps reduce nuisance cycling from sloshing water, foam, and residue in the bilge
• No moving parts, so there is nothing to jam, crack, or wear like a mechanical float mechanism
• Sealed electronics with a chemical-resistant housing and stainless steel components
• 36 inch wire lead for routing in common bilge installations
• Mounts on the bilge floor, on a stringer wall, or alongside a compatible pump basket without extra brackets
• Backed by a 5 year warranty

Installation and setup

On a 12V boat, the main fit check is pump current draw. This switch is built for pumps that stay within the 15 amp limit, so it is important to confirm the pump load before wiring it into an automatic bilge circuit. The 36 inch lead gives enough reach for many compact bilge compartments without forcing splices right at the switch body.

The mounting choices are useful when the lowest part of the bilge is narrow or crowded. Keeping the switch in a spot where water collects naturally will help it respond as intended, while wall or basket mounting can make service access easier on boats where the bilge floor is hard to reach.

Compatibility and fit

This switch is a good match for owners replacing a worn float switch or adding automatic control to a compatible 12V bilge pump. It also works well where the bilge sees motion, foam, or dirty water that can make some mechanical switches cycle more often than they should. If your boat uses a 24V bilge circuit or a pump that pulls more than 15 amps, this is not the right version.

Use on board

This suits boats that spend time at the dock, on a mooring, or on a trailer between trips and still need the bilge protected automatically. It also makes sense for owners who want a cleaner switch setup in the bilge with fewer moving parts to service over time.