Tygon Fuel Tubing -gas-
5/32 inch inside diameter
THE PERFECT FIT!!!!
IV Bag Setup (see picture below):
1.  Cut hard end off of the tip of IV bag  
2.  Insert black IV bag connector
3.  Add water line over other end of connector
4.  Add a tie wrap over the end of the water line and black IV bag connector
5.  Add another tie wrap over tip of IV bag and black IV bag connector