The present invention concerns a transit for leading cables, pipes or wires through a partition in a sealed way. The transit comprises a sleeve (1) and a seal (2) to be received inside a central through opening of the sleeve (1). The seal (2) comprises a base part (7), a front fitting (9) and a rear fitting (10), which front and rear fittings (9,10) are placed at opposite ends of the base part (7). The base part (7) of the seal (2) is made of a compressible material, whereby the front and rear fittings (9, 10) are arranged to be moved towards each other in order to compress the base part (7) of the seal (2). The compression is achieved by co-operating threaded pins (19) and nuts (11). At least one rotating fitting (13) is placed between the front fitting (9) and the base part (7) of the seal (2), and is received on one of the threaded pins (19).