Bridgeport Fittings 1089-5 Reducing Washer 3.5 to 1.5 Inch

Product Description

The BRIDGEPORT FITTINGS 1089-5 is a galvanized steel reducing washer designed to reduce oversized knockout holes in electrical boxes and enclosures. Used in pairs, these washers seat positively in the knockout opening via raised flanges that lock the fitting in place and prevent rotation or pullout. The galvanized steel construction provides corrosion resistance for both indoor and outdoor applications. This washer meets NEMA Standard FB-1 and UL Standard UL-514B, making it suitable for use in listed electrical installations wherever a reducing washer is required by code.

Reducing washers are used when a knockout in a box or enclosure is larger than the connector or conduit being installed. The 1089-5 converts a 3.5-inch knockout opening down to a 1.5-inch opening. This is a common task in residential, commercial, and industrial electrical work when repurposing existing enclosures, installing smaller-diameter conduit into a larger knockout, or correcting field modifications. It is compatible for use with connectors or rigid conduit at the reduced opening size.

Key Features

• Reduces a 3.5-inch knockout to a 1.5-inch opening when installed in pairs
• Raised flanges provide positive seating and secure fit in the knockout
• Galvanized steel construction offers corrosion resistance for interior and exterior use
• Meets NEMA Standard FB-1 and UL Standard UL-514B for listed electrical installations
• Compatible with connectors or rigid conduit at the 1.5-inch reduced opening

Compatibility

Designed as an OEM-style replacement and standard-use reducing washer for electrical boxes and enclosures requiring knockout reduction from 3.5 inches to 1.5 inches. Compatible for use with connectors or rigid conduit per the manufacturer.

Installation Notes

Installation is performed by licensed electricians and should be done with the circuit de-energized and the enclosure isolated from power. Reducing washers are installed in pairs, one on each side of the enclosure wall at the knockout opening. All work should comply with applicable NEC requirements for fittings used in electrical enclosures. Do not use a single washer alone as a substitute for the paired installation method.

Technical Specifications

• Material: Galvanized Steel
• Knockout Size (Large): 3.5 inches
• Knockout Size (Reduced): 1.5 inches
• NEMA Standard: FB-1
• UL Standard: UL-514B

Standard Information

• Brand: BRIDGEPORT FITTINGS
• Manufacturer Part Number: 1089-5