Extra hose, whats it for?

[Aceallenk]

Winterized my new to me trailer, but there is another 1/2 inch hose in the compartment where all the other plumbing is (water pump, water heater, valves, ) Its not the line to the pump for sucking winter antifreeze cause I used that one when I winterized. I blew into this extra line and kinda think it goes into the fresh water tank! Is there a spare hose there for any other reason that I can't think of. This extra hose had a hose clamp on it (after market) and the hose goes down the same hole in the floor as the water fill hose, city water line, fresh water suction line. It has me buffaloed as I see no purpose for it, so thought maybe someone might have an exact purpose. Thanks in advance to anyone for your answer.

[DavisK]

It may be the fresh water tank vent/overflow hose. If so, it should be connected to the tank on one end and a vent outlet next to the tank fill on the side of the trailer.

[Aceallenk]

Thanks DavisK, will check that out tomorrow morn, makes sense now that I hear it.

[Aceallenk]

Yepper, vent hose. Put it back to where it belongs this morning.