It is a whirlpool gold. the hose goes from the water supply in the wall through the refrigerator ice maker and water dispenser.(NNN) NNN-NNNN It's plastic
I found it. GS6NBEXRS01
are you looking item 37 in the diagram below?
The part number is(NNN) NNN-NNNN, and can be ordered at http://www.apwagner.com/ or http://www.repaiclinic.com/