Hot water lines coming off water tank on Tayana 37?

[Tayana_37]

I am replacing the water lines on a Tayana 37 and I have managed to run new lines to the pump. I have also traced the vent lines for each tank. There is a third water line attached to each tank that I have not yet been able to trace due to tight quarters. Any ideas on what these lines are going to?

[Sailmonkey]

Manual pump at the galley sink?

[Tayana_37]

Thanks, I took a look at that but there is not a handpump on the sink, just a filtered drinking water tap on the pressurized side. I will next try to follow the lines with a scope to see where they go.