SHURFLO Pump Switch Assembly 94-800-05 for 4008/4028 Series — OEM direct-fit replacement, restores pressure control

The SHURFLO PENTAIR 94-800-05 Pump Switch Assembly is a direct replacement switch component designed to restore pressure-control function on compatible SHURFLO 4008 and 4028 series pumps.

If a SHURFLO diaphragm pump has stopped cycling correctly, a failed switch assembly is a common, easy-to-replace cause. The 94-800-05 is sold as a single-unit replacement and engineered to fit factory pump housings for models 4008-101-E65, 4008-131-E65, 4028-100-E54 and 4008-171-E65. Intended as a like-for-like repair part from the original equipment manufacturer, it offers a straightforward path to restoring reliable on/off pressure operation without replacing the entire pump.

Will this switch assembly fit my SHURFLO pump model?

Check the pump model stamped on your pump housing before ordering. The 94-800-05 was produced to match mounting and electrical connections on several SHURFLO 4008 and 4028 family pumps, making it a compatible swap for those listed models.

• Compatible with: 4008-101-E65, 4008-131-E65, 4028-100-E54, 4008-171-E65
• OEM part number: 94-800-05 for direct replacement
• Matches factory electrical terminals and mounting footprint

How do I install the replacement pump switch assembly?

Installation is a simple mechanical and electrical replacement if you follow basic safety steps. Isolate power, note wiring positions, remove the old switch, mount the new assembly, then reconnect wires in the same configuration and test the pump at low pressure.

• Turn off and disconnect power before beginning work
• Label or photograph wiring to ensure correct reconnection
• Secure mounting screws to the original torque to avoid leaks or vibration

What are the physical and shipping details for this part?

The switch assembly ships individually in compact packaging suitable for storage or immediate installation. The package dimensions and light weight make it easy to keep as a spare or to ship for fast service response.

• Package dimensions: 7" L x 5" H x 2" W
• Package weight: approximately 1 pound
• Country of origin: Mexico — genuine SHURFLO part

How does replacing the switch help pump performance?

Replacing a worn or failed switch restores the pump’s ability to auto-start and stop at preset pressures, eliminating continuous running or failure to pressurize. This fix addresses the electrical control side of pump operation without disturbing the diaphragm or motor when those components remain serviceable.

• Stops continuous motor run caused by switch failure
• Re-establishes automatic pressure cycling and cutoff
• Minimizes downtime with a direct-fit replacement part

Who is this for: This pump switch assembly is intended for boaters, RV technicians, plumbing contractors, and maintenance professionals who service SHURFLO 4008 and 4028 series pumps and prefer to repair rather than replace the entire pump. It’s also useful for owners keeping a spare on hand to quickly restore pump function in field or marine environments.