A pressure hose for a water-carrying system, especially for connecting sanitary taps or for connecting parts of the water-carrying system, having a corrugated inner hose made of plastic. At least one hose end of the pressure hose is provided with a connecting piece, designed such that it differs from the inner hose, for joining the pressure hose to a complementarily designed connecting piece of a sanitary tap and/or a part of the water-carrying system. The inner hose and the connecting piece are formed as one piece and the inner hose and the connecting piece are preferably produced via extrusion in a common extrusion process.

A system and method for replacing or substituting mold blocks in a corrugator, the corrugator comprising first and second tracks for carrying respective chains of mold blocks, each of the tracks comprising return tracks, wherein the system advances replacement mold blocks towards the return tracks to displace corresponding mold blocks in the mold block chains while the corrugator is in production and while the mold block chains are in motion.