Nylon Knockout Seals effectively plug electrical knock-outs. They are molded from 6/6 Nylon, in a gray color to resemble galvanized steel. They come in 6 trade sizes to fit 1/2" to 2" knock-out holes. (Notes: Locking fingers in fractional increments up to the maximum panel thickness.)
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Item #

Item Name

Approximate Head Thickness

Head Diameter

Mounting Hole Diameter

20300020-99I N/A HEYCO® 2.140 Inch (in) Head Diameter Nylon Hole Plug for Knockout Sealing N/A 0.063 in N/A 2.140 in54.40 mm N/A 2.000 in50.80 mm
20300696-A070 N/A HEYCO® 1.500 Inch (in) Head Diameter Nylon Hole Plug for Knockout Sealing N/A 0.063 in N/A 1.500 in38.10 mm N/A 1.375 in34.90 mm
20796001-A070I N/A HEYCO® 1.015 Inch (in) Head Diameter Nylon Hole Plug for Knockout Sealing N/A 0.063 in N/A 1.015 in25.80 mm N/A 0.875 in22.20 mm
20796004-A21I N/A HEYCO® 1.906 Inch (in) Head Diameter Nylon Hole Plug for Knockout Sealing N/A 0.063 in N/A 1.906 in48.40 mm N/A 1.750 in44.50 mm
20918002-A030I N/A HEYCO® 1.218 Inch (in) Head Diameter Nylon Hole Plug for Knockout Sealing N/A 0.063 in N/A 1.218 in31.00 mm N/A 1.093 in27.80 mm
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