Galvanized zipper with teeth that act as an opening or closing activator for casement windows in greenhouses.
- Benefits: Together with the gearbox and pinion, they operate in such a way that the function is to raise the upper window of a casement curtain by means of the rotation of the gear of the gearbox and pinion.
- Differentiation: Some competing zippers are Chinese, causing the teeth to rust or wear down.