I found this hose under the dinette in the same compartment that has my black water holding tank for the forward head (port side).

This hose passes through the compartment and is not part of plumbing for the forward head.

This hose passes under the dinette floor and appears to go into the same compartment as the salong AC unit underneath the forward dinette seat. However, looking in the AC compartment I cannot find this hose, so I assume that it must be under the floor supporting the AC.

Following the hose aft, it passes through the bulkhead and passes into the engine compartment (again port side).

I was unable to easily ID in the engine compartment from the center hatchway - and the Admiral has her couch over the top of the port engine hatchway.

I can move the furniture around and gain access to chase it further - was hoping that someone would know what it was for