Tronic PVC Cavity Box, 2 Gang, 29mm Deep

Our review

This Tronic cavity box is a mounting accessory for electrical switches and sockets, made from PVC and sized to fit two gangs at a depth of 29mm. It is intended for plasterboard and other hollow wall installations, where a box needs to sit behind the finished surface and hold the wiring and faceplate securely. It suits electricians, renovators, and anyone finishing a stud wall who needs a clean mounting point rather than cutting a makeshift opening. PVC keeps the unit light, which makes it easier to position and hold while fixing, and it resists the kind of wear that comes with being embedded in a wall. Before buying, check that the wall thickness and the depth of your switch or socket mechanism suit a 29mm box, and confirm you need a two-gang size rather than a single. Compare with metal back boxes, which are stronger but heavier and can be harder to cut into plasterboard cleanly, and with other plastic boxes on the market, where the plastic grade and fit tolerances vary. If your wall is solid masonry rather than hollow, a different type of box will be needed. This item is available on Sokonia.