NBN22B has a slimline design (only 31mm deep) with softly rounded corners for a sleek, modern effect wherever it's installed. No plastic is visible around the matching black nickel switches and the finish is also lightly lacquered to reduce the impression of fingerprints. Easily retrofitted into existing backboxes (25mm minimum box depth required) and are supplied with colour coded fixing screws. Fitted with a moisture-control gasket which enables it to be installed into recently plastered walls without the risk of tarnishing the finish. Twin earths are fitted as standard to facilitate high-integrity protective connections.