This spring does the hard work of pushing the outer sheath of the Mori Filler nozzle back into place, and shutting off the flow of liquid into the bottle. Replacing this spring will bring some snappiness back to your nozzles.

While you're here, we recommend a very light coating of food-grade grease on the area just behind the spring. This helps keep the nozzle extension and retraction smooth, and prevents damage to the rubber cup seal that sits underneath the spring. FM CSC EP 2 grease works great.