380: Anyone know the fresh water hose size?

[Zoid]

I just purchased a US manufactured water filter (Seagull) to install on my 2013 Lagoon 380. All I need to do is use a T connector in the cold water line right after the fresh water pump to connect in the filter to the water supply. Then I have a faucet that comes off the filter that will provide filtered drinking water. Sounds good, right?

Well here is my issue, although minor: sizing the T Connector. The Lagoon water lines are not marked with their interior diameter or any sizing information. For the life of me I cannot get one off any connection on the boat without having to cut it. As soon as I cut it we are without water until I fix it (we live aboard). So cutting it, measuring the interior, then going to the hardware store (I'm in Italy so who knows if they will have it in stock), etc. will all have to happen while the boat will be without water.

So I need the interior diameter to purchase the appropriate connector and was hoping someone on this thread knows the diameter and could save me some trouble.

Any ideas?

[seelka]

I inserted a T-connector to add a dishwasher:

the inner diameter of the blue fresh water hose is 12.5 mm (outer diameter is 21.5 mm (2009 L380-S2)).

[Zoid]

That is exactly what I needed. Thanks a lot!