DELTA fläche IP44 AP sliding nipple, without hole Our surface-mounted range DELTAfläche IP44 offers you an attractive design, increased safety and easy operation. The surface-mounted range DELTAfläche IP44 impresses with its break- and impact-resistant thermoplastic housing. All switch and socket inserts have screwless terminals for wiring. With the insulated release levers you can release the conductors without tools and without touching them. DELTA switches and sockets - design and quality in perfection from Siemens.