The 1 Gang Dry Lining Box offers reliable housing for electrical outlets or switches in drywall or cavity wall installations. With a depth of 35mm, it provides ample space for wiring connections while ensuring a neat, flush finish when installed. Featuring a large flange, it prevents slipping into the cavity and supports plasterboard depths of 6.35mm to 15mm, making it perfect for mounting electrics into dryline cavity walls. Additionally, this box is designed to accommodate Samotech modules such as SM308, SM309 and SM323, making it an excellent choice for both residential and commercial applications.
Dry Lining Knockout Back Boxes
£0.99
Dry lining knockout back boxes – 1-2 gang 35mm depth for plasterboard 6.35–15mm. Designed to house SM308, SM309 and SM323 modules.
- Dry-lining knockout back boxes designed for plasterboard installs
- 35–47 mm depth – the recommended depth for fitting many smart switches and modules
- Available in 1-gang and 2-gang configurations
- Sized for SM308, SM309 and SM323 Samotech modules
- Fits plasterboard from 6.35 mm to 15 mm thickness
| Brand | Samotech |
|---|
Frequently Asked Questions
What is a dry lining knockout back box?
A dry lining back box is a recessed enclosure designed to mount switches, sockets, and electrical accessories into plasterboard or cavity walls (drywall). The "knockout" feature allows you to remove pre-cut sections to route cables in from the desired direction.
What are the dimensions of the SMBBXS back box?
Internal depth is 35mm (or 47mm depending on variant), with adjustable lugs to fit plasterboard thicknesses from 6.35mm to 15mm. Available in 1-gang and 2-gang configurations to match standard UK switch / socket plates.
Which Samotech modules fit inside this back box?
The 35mm depth comfortably accommodates the Samotech SM308 (switch module), SM309 (in-line dimmer), and SM323 (rotary dimmer) — making it the right choice when installing these modules into plasterboard walls behind a switch.
What plasterboard thickness does the back box support?
The back box has adjustable lugs supporting plasterboard depths from 6.35mm to 15mm — covering the full range of common UK plasterboard installations including 9.5mm and 12.5mm.
Where are the knockouts positioned?
Knockouts are positioned at the top, bottom, and rear of the box, with three knockouts total at 25mm size. This gives flexibility in cable entry direction depending on where your wiring runs.
Are fixings included?
No — fixings are not supplied. The back box uses an adjustable lug system that grips the plasterboard, plus a large flange that prevents the box slipping into the cavity. Provide your own plasterboard screws if needed for additional fixing.
When do I need a dry lining back box vs a regular back box?
Use this dry lining back box when installing into plasterboard or cavity walls (drywall) — the lugs grip the plasterboard from behind, providing secure mounting without needing access to the masonry behind. For solid masonry walls, use a standard recessed metal back box chased into the masonry.
Technical Data
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Appleby make the best dry lining boxes and it’s good they sell these.