Octagon Box, 22.5 Cubic Inches, 4 Inch Diameter x 2-1/8 Inches De | Crescent Electric Supply Company
4 in. Octagon Fan & Fixture Support Box 2-1/8 in. — Primus Cable
SWIR 54151-1/2 4in Octagon Box 1-1/ | North Coast
Octagonal Junction Box - Centaur Installation
Appleton® 4O-3/4 ETP Octagon Box, Steel, 15.5 cu-in, 9 Outlets, 9 Knockouts | Steiner Electric Company
Carlon® A615DE ENT Flexible Raceway Octagon Ceiling Box, PVC, 20.5 cu-in Capacity, 6 Knockouts, 2-1/8 in D Dimensions | SMC
Steel City 54151-1/2&3/4 Outlet Box, Octagon, Drawn Construction, 4-Inch Diameter by 1-1/2-Inch Depth, Galvanized - Electrical Boxes - Amazon.com
Steel City 4 in. 1-1/2 in. New Work Deep Pre-Galvanized Metal Octagon Electrical Box Extension Ring 551511234-25R - The Home Depot
Hubbell Raco 4 in. Octagon Box, Drawn, 1-1/2 in. Deep, Two 1/2 & Six 3/4 in. KO's, Raised Ground, Gray, (126): Electrical Boxes: Amazon.com: Tools & Home Improvement