Front panel 3HE/7TE with LC-D couplings, slotted ceramic guide sleeve for singlemode and multimode applications, suitable for installation in OpDAT REGpro and OpDAT REG S, powder-coated sheet steel, grey, variants: equipped with LC-D couplings each blue (OS2), lime green (OM5), violet (OM4), aqua (OM3), beige (OM2) or green (OS2 APC)