Mystery of the skin fitting

Whist admiring the coppercoat the other day I noticed this fitting

      Now this beauty is a bit odd, because it is not bronze like the others and it appears to have an external filter fitting missing, when one looks inside it there is a corrugated metal inside disappearing internally.     Now if there wasn't a bloody great engine on the saloon floor, an easy follow up would have been possible

A bit in the way!

Anyway after some googling I managed to identify a close match with an Isotherm fridge cooler, a clever device that uses sea water as a heat sink. Apparently it can have an anode attached although the jury is out on whether it is really necessary . The hell with it with the boat out of the water I would be foolish not to replace it just in case. I would not want a corroded fitting without a seacock.come to think of it I would not want any fitting without a seacock! Add that to the job list first mate.