Overview
The ABB Carlon B121ADJH Adjust-A-Box is a single-gang horizontal non-metallic electrical outlet box designed for fast, code-compliant receptacle installations in remodel and new construction. Its patented adjustable screw mechanism accommodates wall thicknesses from 0″ to 1-7/8″, eliminating the need for depth spacers or shimming. The horizontal orientation makes it the preferred choice for kitchen countertop, bath, and baseboard receptacle locations where standard vertical boxes are impractical.
The box is constructed from blue PVC — a recognized identifier for power circuits — and features a clip-on metal mounting bracket that snaps securely onto standard wood or metal studs without screws or nails. Optional mounting holes are provided for non-standard studs or high-vibration environments. Sold in a box of 100 units.
Key Features
- Horizontal single-gang orientation for kitchen, bath, and baseboard receptacle mounting
- Adjustable wall depth: preset at 1/2″, adjustable from 0″ to 1-7/8″ with a single screw turn
- Large 21 cu. in. capacity — accommodates duplex and GFCI receptacles with ease
- Blue PVC construction for at-a-glance power circuit identification
- Metal clip bracket mounts to wood or metal studs without screws or nails
- Optional mounting holes available for non-standard or secure-mount applications
- Compatible with ceramic tile, baseboards, and multi-level island installations
- UPC: 034481-01138 | Catalog No. B121ADJH
Specifications
| Manufacturer | ABB (Thomas & Betts) — Carlon Brand |
|---|---|
| Model / Catalog No. | B121ADJH |
| Box Style | Single-Gang, Horizontal |
| Material | PVC (Non-Metallic) |
| Color | Blue |
| Dimensions (L x W x H) | 3.4 x 5.4 x 2.3 in (overall); 3-3/4 x 3-7/8 x 3-3/8 in (box size) |
| Capacity | 21 cu. in. |
| Mounting Type | Adjustable Bracket (clip-on metal) |
| Wall Thickness Range | 0″ to 1-7/8″ (preset at 1/2″) |
| Mounting Hardware | Clip-on metal bracket; optional screw mounting holes |
| Country of Origin | United States |
| UPC | 034481-01138 |
| Standard Package Qty | 100 ea (sold per 100) |
| Graybar ID | 25522968 |



