Multiquip 1518183040 Water Switch

The Multiquip 1518183040 Water Switch is a genuine OEM component designed for DCA-series ultra-silent diesel generators, including the DCA125USJ, DCA45SSIU3, DCA45SSIU3-50HZ, DCA45SSIU3-60HZ, DCA70SSJU, and DCA70SSIU2-FEMA. Sourced directly from Multiquip, this part meets the exact specifications of the original unit your generator shipped with. It is a direct swap for the worn or failed switch in your DCA-series machine, with no adaptation needed to match the original mounting and wiring configuration. When you need to keep a critical generator running reliably on the jobsite, using the correct OEM part is the straightforward choice.

Key Features

• OEM-Matched Switching Threshold — Built to the original activation and cutoff parameters, ensuring the coolant protection circuit responds accurately under real operating conditions.
• Direct Plug-In Replacement — Matches the original connector, thread pitch, and body dimensions of the factory-installed switch for a clean installation on DCA-series generators.
• Broad DCA-Series Fitment — Compatible with DCA125USJ, DCA45SSIU3, DCA45SSIU3-50HZ, DCA45SSIU3-60HZ, DCA70SSJU, and DCA70SSIU2-FEMA ultra-silent generator models.
• Engine Protection You Can Count On — A correctly functioning water switch triggers the engine shutdown circuit before coolant loss causes irreversible engine damage, protecting a high-value asset.
• Critical Safety Function — In generator applications where unattended operation is common, a properly calibrated water switch is a frontline defense against catastrophic overheating events.

The water switch monitors coolant level or coolant temperature within the engine cooling system and sends a signal to the generator's protection circuit when conditions fall outside safe limits. When the switch detects a low coolant condition, it triggers a warning or initiates an automatic shutdown to prevent the engine from running dry and suffering serious internal damage. A failed or stuck water switch can either allow the engine to run unprotected through a coolant loss event or cause nuisance shutdowns that interrupt power delivery — both outcomes that make prompt replacement with a correct OEM part essential for dependable generator operation.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.