attwood bilge pump float switch 4202-7 — 12/24V CE-rated, 36" lead, 2" trip, low-profile

Attwood's 4202-7 float switch converts a manual bilge pump into an automatic, reliable water-level controller that activates at about 2 inches.

This compact, low-profile float switch is built for marine environments where dependable, straightforward bilge control matters. It uses a sealed mechanical switching mechanism with a protective cover to reduce false triggers from sloshing and debris. The unit is CE-rated for 12- and 24-volt systems, has a 36-inch lead, and is RoHS compliant and mercury-free — qualities valued in both recreational and workboats.

How does this float switch control a bilge pump?

The switch contains a mechanical actuator that closes the circuit when water lifts the float to the trip point, powering the pump. When water falls below the release level the switch opens, stopping the pump so it doesn't run dry. The design isolates the electrical leads from float motion to reduce wear and wiring fatigue.

• Actuation triggers at approximately 2 inches of water
• Sealed switch resists moisture and fumes
• 36-inch wire leads for flexible placement
• Maximum draw: 12A at 12V, 6A at 24V

Where and how can I mount the Attwood 4202-7 on my boat?

The unit mounts on any surface from horizontal up to a 24-degree incline, making it suitable for bilge floors, stringers, or angled compartments. Its low-profile footprint fits into tight spaces and the integral cover helps stabilize the float in rough conditions. Fasten with screws through the base while keeping the wiring clear of moving parts.

• Mounts flat or up to 24° incline
• Compact dimensions: 4¼" L × 3 7/8" W × 1 3/8" H
• Protective cover reduces false cycling from slosh
• Includes 36" pre-wired leads for easy routing

Is this switch safe and compatible with my electrical system?

The 4202-7 is CE-rated for both 12V and 24V DC systems and is marine ignition protected. Its sealed mechanism reduces risk from moisture and fuel vapors, and the switch contains no mercury. Check the pump's current draw against the switch rating or use a relay if your pump exceeds the 12A/6A limits.

• CE-rated for 12V/24V operation
• Marine ignition protection and RoHS compliant
• Mercury-free construction
• Use a relay for pumps drawing more than rated amps

How does the design reduce the need for maintenance?

The float's wiring is fixed rather than hinged, lowering stress on connections and extending service life compared with some competitors. The sealed switch and cover keep debris away from the actuator and dampen motion, which reduces unnecessary pump cycles and wear on the pump motor. Routine inspection and cleaning are still recommended in heavily soiled bilges.

• Fixed wire leads prevent repeated flexing and fatigue
• Integral cover limits debris and slosh-triggered cycling
• Sealed switch minimizes moisture intrusion
• Simple design eases troubleshooting and replacement

Who is this for: The Attwood 4202-7 is aimed at boat owners, fleet managers, and marine technicians who want a compact, dependable automatic bilge switch for small to medium bilge pumps. It suits anglers, weekend boaters, and commercial operators needing a low-maintenance automatic activation solution that fits tight spaces and complies with common marine safety standards.