Fabricated inlet manifolds incorporating water jacket to stop icing. The Allihn condenser consists of a long glass tube with a water jacket. Small pressure vessels are normally tested using a water jacket test. Other operations included the monitoring of the water jacket temperatures of both prime movers. The water-cooled M1917 was inappropriate due to weight and the vulnerability of the water jacket. The brake's drum is surrounded by a water jacket. The engine cooling is via liquid in a water jacket. Water-cooled engines contain passages in the engine block where cooling fluid circulates (the water jacket). The naphthalene was melted and vaporised by a water jacket, heated by the engine. Water jacket repairs are common on many of the engines that still exist. The engine was ruined with a cracked water jacket in sight of victory. To remedy this, Mazda engineers added a water jacket passage into the side housing. Each fuel cell had its own cooling and moderating water jacket. The communal water jacket of monobloc designs permitted closer spacing between cylinders.