Single Plaster Trim 3mm
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Add this trim to our single bespoke back box so you can plaster it into the wall. It’s the best way to get a perfect finish and the switch or socket plate sitting exactly flush.
It raises the box 3mm away from the wall for skimming (use our 9mm trim for thicker rendering).
- Made from recycled and recyclable post-consumer plastic
- Fire retardant
- Use with our bespoke back boxes designed for our Kew switches and sockets
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In Stock
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We dispatch all orders quickly so you can expect delivery in days, not weeks.
We sell direct so we can put the needs of our customers first.
We craft our products in-house so we can strive for excellence without compromise.
We use sustainable materials and build products that last.

FAQs
We recommend using a professional to fit all Corston products. Electrical items must be installed by a qualified electrician.
When you're happy with your chosen look, secure the clear front plate over the backing paper to conceal the wires.
All Corston electrical products should be installed by a qualified electrician.
For help with creating your own combinations, just give us a call.
Centre retractive: this version has springs that make sure the switch returns to the centre OFF position. It can be pressed up or down to make two separate connections. middle OFF position.
* Both versions must be used with one in-line dimmer module per circuit.