Clear Armored 20mm Espresso Machine Drain Hose - Per Foot
It's a drain hose! It works!
The hose that came with my gs3 was too short. I ordered this as a replacement and it works great. Much better than standard 3/4" hose. It is very flexible and doesn't collapse when it has a 90 degree bend.
The smaller diameter hose would not fit on Nuova Simonelli espresso machine drain cups. This fit much better and could clamp to a water tight fit on the drain cup.