attwood unisex bilge float switch — 12V/24V marine pump controller, sealed cover, test knob

Attwood's automatic bilge float switch converts a manual bilge pump into a hands-free, reliable pump controller with a sealed cover and a built-in test knob.

This compact marine float switch is built to keep your bilge pumping only when needed. Designed for simple surface mounting (horizontal up to a 24° incline), the unit uses a dependable mechanical switch that trips at roughly 2 inches of water. Its protective cover reduces false cycling from bilge slosh and helps keep debris away from the float, while a protruding test knob provides an easy way to check operation without removing the cover.

How does this float switch improve bilge pump performance?

The switch automates pump activation so water is removed as levels rise, cutting down on manual checks. The sealed mechanism resists moisture and fumes, and the cover design smooths out bilge motion to prevent unnecessary on/off cycling. With 36" wire leads and compatibility with both 12V and 24V systems, it integrates with most small-boat pump setups.

• Activates pump at about 2 inches of water for timely drainage
• Cover dampens bilge slosh to reduce pump cycling
• Sealed switch resists moisture, fumes, and electrical shock
• 36-inch wire leads for flexible installation locations

Will this fit my boat and mounting configuration?

The Attwood switch is compact and mounts on flat surfaces from fully horizontal to a 24° incline, making it suitable for most bilge layouts. Its footprint (5 1/4" L x 3 7/8" W x 2 7/8" H) keeps it unobtrusive while still providing an easy-to-access test knob. The flexible wire length helps reach existing pump wiring or a nearby bilge power source.

• Mounts horizontal up to a 24° angle for broad compatibility
• Overall size: 5 1/4" x 3 7/8" x 2 7/8" (L x W x H)
• 36" length wire leads to connect to pump and power
• Compact profile fits tight bilge compartments

What electrical ratings and limits should I observe?

This float switch is CE rated for 12V and 24V systems and has defined maximum amp loads to match common marine pumps. At 12 volts the switch supports up to 12 amps, and at 24 volts up to 6 amps. Its sealed mechanical design reduces electrical hazards, and the product is marine ignition-protected and RoHS compliant.

• 12V rating: maximum 12 amps
• 24V rating: maximum 6 amps
• Sealed switch mechanism for safer operation in wet environments
• Marine ignition protected and RoHS compliant

How do I test and maintain the switch for long service life?

The exposed test knob lets you activate the switch without removing the cover, enabling quick routine checks. Periodically inspect the cover and wiring for damage or debris; the switch contains no mercury and resists corrosion better than some older designs. If your bilge environment accumulates sediment or grease, clean around the mounting area to preserve reliable float movement.

• Use the protruding test knob to verify operation easily
• Inspect wiring and cover for wear during regular maintenance
• Avoid heavy debris build-up around the float for consistent actuation
• No mercury inside — safer disposal and compliance advantages

Who is this for: boat owners and marine technicians who want a compact, dependable way to automate a manual bilge pump. Ideal for small to medium-sized vessels where space is limited but reliable, ignition-protected bilge control is required. Attwood's long marine history and RoHS-compliant construction make this a practical upgrade for cruisers, fishing boats, tenders, and workboats seeking hands-free bilge management without complex wiring or large control panels.