Carlon B618R-UPC 4-1/4\ Round Box, Old Work, Cubic Inches: 18\
- Used for extending set back electrical boxes up to 1-1/2-inches, levels and supports wiring device.
- Automatically levels and supports outlets, switches, GFCIs, and other standard devices.
- Works with handy boxes and 4-inch square electrical boxes with plaster rings for single switches.
- Manufactured from 94VO rated flame retardant plastic for safer installations, two hour fire rating.
- Used for extending set back electrical boxes up to 1-1/2-Inch, levels and supports wiring device.
- Also used for handy boxes and 4-Inch square electrical boxes with plaster rings for single switches or receptacles.