Gmat: Nope, actually all vinyl tubing
Was thinking of replacing all of it with tygon soon though
I am sure I am loosing the water becuase my res. is not sealed at the top. I WANT to allow for expansion in my res. so my system doesnt build up unnecessary pressure.
Edit: BTW I acutally think I am only loosing about 1 oz of coolant every (2) weeks. I hardly fill it up at all any more.