I have a controller for my electric underfloor heating which is the same size as a single light switch / 13 amp socket. I want to use a surface mount box but the fixing mechanism is not the same as a standard pattress box. Obviously, the standard switch has two holes in it through which screws pass to screw into captive 'nuts' within the body of the pattress box. However, on the controller that I have there are no holes through which the screws can pass; rather, on the reverse there are two slots which would appear to locate on some sort of cheesehead arrangement and then twist to locate in position.
My question is, where can I find such a pattress box that would fit this controller?
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