This is a Murr Elektronik Cable Gland, manufactured as part of the 7000 series. It is a NPT Thread Gland M50, made of polyamide, with a diameter of 50mm, and a thread size of M50 x 1.5. It is black in colour, and supplied with an earth cable clamp and a fastening nut. It is an IP68 rated, weatherproof gland, suitable for the protection of cables from moisture and dust.