Description For Adding Additional Cubic Capacity Or As An Outlet Box For Surface Conduit. Eight 1/2" And Four 3/4" Conduit Knockouts (Sides). 4" Square X 1-1/2" Deep. 22.5 Cubic Inches. UL Listed.
Hubbell Raco Electrical Box Extension Ring 1 Gang, 22.5 Cu-In, 4 In L X 4 In W X 1-1/2 In D
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