Abstract: Disclosed is a safety shower or liquid delivery system (1). A deluge head (2) is supported by a liquid supply line (3). Supply line (3) comprises an inner pipe section (4) around which is located a porous sleeve (5) so as to define a liquid jacket (7) around pipe (4). The system is typically employed as an emergency deluge system to douse a worker for example with water in a situation where the worker has been subjected to exposure to some infectious, poisonous, corrosive or otherwise harmful substance. The water delivered via the deluge head (2) to the worker will be maintained at a safe temperature level within inner pipe section (4) by the cooling effect of water within the liquid jacket (7).