Eaton 366 Knockout Reducing Washer 3 to 1 Inch Rigid Imc

Product Description

The EATON 366 is a steel knockout reducing washer from the Crouse-Hinds series, designed to adapt an oversized knockout opening to a smaller conduit fitting. When a conduit fitting or locknut does not match the knockout diameter in an enclosure or box, this washer fills the gap and provides a secure, flush seating surface. It is rated for use with rigid metal conduit (RMC) and intermediate metal conduit (IMC) installations. At 0.05 inches thick and weighing 0.14 pounds, it is a compact, lightweight component handled daily by commercial and industrial electricians in panel, junction box, and enclosure work.

This reducing washer is used wherever a 3-inch knockout must be reduced to accept a 1-inch conduit fitting. Typical applications include electrical enclosures, pull boxes, panelboards, and junction boxes in commercial and industrial settings. It is a standard item in conduit rough-in work and is commonly used when reusing existing knockouts for smaller conduit runs or when field conditions require a different conduit size than originally planned.

Key Features

• Reduces a 3-inch knockout to accept a 1-inch conduit fitting
• Steel construction for durability in rigid and IMC conduit systems
• Thin 0.05-inch profile seats flush against the enclosure wall
• Lightweight at 0.14 pounds for easy single-hand installation
• Part of the Crouse-Hinds series, a widely stocked commercial conduit product line

Compatibility

Designed as an OEM-style reducing washer for use with rigid metal conduit and intermediate metal conduit (IMC) fittings in standard electrical enclosures and boxes with 3-inch knockouts requiring reduction to 1 inch.

Installation Notes

Installed by licensed electricians in accordance with NEC requirements for conduit fittings and enclosures. De-energize the enclosure and verify the absence of voltage before opening any panel or junction box. Seat the reducing washer flat against the enclosure wall before threading on the conduit locknut to ensure proper clamping and a secure fit. Do not stack multiple reducing washers to achieve a size reduction not covered by a single washer.