Simon
Exhaustmanifold.
Below I have indicated the components your inquired. The seacooling water from the engine ends up into the exhaust manifold coolingcasing, with all the bends and pipes, air could easily be trapped causing problems with the coolingsystem, hence the rather extensive deairation, which ends up in a common funnel aft in the engineroom. On the systemsketch below the principle is shown, howewer as you see the practical solution differ slightly from the systemsketch.
The other item is the wire for remote reading of the exhaust temperature, for each cylinder, hence 6 wires. The 6 analog rectangular meters is very dominating at the manuevering stand.
Tore