40ESPL 4" Octagon Box Extension Ring, 1-1/2" Deep, 1/2" & 3/4" KOs, Steel

4" Octagon Box Extension, Metallic. 1-1/2" Deep, Side Knockouts: (2) 1/2" & (2) 3/4". Cubic Inches: 15.5".

Appleton and O-Z/Gedney metallic 4" octagon boxes, extension rings and covers are widely recognized for quality, selection and ease of installation. They may be used as a junction box or a device box for switches, receptacles, GFCIs, etc. Manufactured of durable materials with consistent construction means easy installation, making all the difference in the speed and final quality of any wiring job.