Part Number: 786189104226 <br> Part: Cooper Crouse-Hinds TP422 4" Square Extension Ring, 1-1/2" Deep, Welded, Metallic <br> 4 Inch Square Extension Ring, 1-1/2 Inch Deep, Welded, Metallic, Side Knockouts: (8) 1/2 Inch and (4) 1/2 and 3/4 Inch Eccentric, Attaches to Switch Boxes, Cubic Inches: 21.0 <br> Material: Steel, Metallic <br> Type: Welded, Extension Ring, Extension, 4" Square <br> Product Depth: 1 1/2 in <br> Cubic Inches: 21 in <br> Knockouts: 1/2 in, 3/4 in, 12-KO <br> Also known as: 786189104226, CROTP422, Cooper Crouse-Hinds, TP422, 4" Square Boxes - Extensions, 4" Square Boxes & Accessories, Boxes - Metallic, Boxes, Enclosures, Crouse-Hinds <br> Equivalent to: </p><ul></ul>