PDL 89DI double insulated, heavy duty mounting block to suit all single gang accessories - power points, light switches etc. Ideal for any situation where mains electrics are being installed to a metal frame but particularly suited to caravans, RVs or trailers. Multiple conduit entries allow for very tidy installation by capping or conduit. Double insulated refers to the level of protection achieved when correctly installed with conduit. 118 x 74 x 43 deep